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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.configuration;
<a class="jxr_linenumber" name="19" href="#19">19</a>  
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.io.Serializable;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.util.Collection;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.Collections;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Iterator;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.LinkedHashSet;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.LinkedList;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.util.Stack;
<a class="jxr_linenumber" name="30" href="#30">30</a>  
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.event.ConfigurationEvent;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.event.ConfigurationListener;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ConfigurationNode;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ConfigurationNodeVisitorAdapter;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.DefaultConfigurationNode;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.DefaultExpressionEngine;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ExpressionEngine;
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.NodeAddData;
<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ViewNode;
<a class="jxr_linenumber" name="40" href="#40">40</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.lang.StringUtils;
<a class="jxr_linenumber" name="41" href="#41">41</a>  
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;A specialized configuration class that extends its base class by the</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * ability of keeping more structure in the stored properties.&lt;/p&gt;&lt;p&gt;There</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * are some sources of configuration data that cannot be stored very well in a</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * {@code BaseConfiguration} object because then their structure is lost.</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * This is especially true for XML documents. This class can deal with such</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * structured configuration sources by storing the properties in a tree-like</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * organization.&lt;/p&gt;&lt;p&gt;The internal used storage form allows for a more</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * sophisticated access to single properties. As an example consider the</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * following XML document:&lt;/p&gt;&lt;p&gt;</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &amp;lt;database&amp;gt;</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> *   &amp;lt;tables&amp;gt;</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> *     &amp;lt;table&amp;gt;</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> *       &amp;lt;name&amp;gt;users&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> *       &amp;lt;fields&amp;gt;</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> *         &amp;lt;field&amp;gt;</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> *           &amp;lt;name&amp;gt;lid&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> *           &amp;lt;type&amp;gt;long&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> *         &amp;lt;/field&amp;gt;</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> *         &amp;lt;field&amp;gt;</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> *           &amp;lt;name&amp;gt;usrName&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> *           &amp;lt;type&amp;gt;java.lang.String&amp;lt;/type&amp;gt;</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> *         &amp;lt;/field&amp;gt;</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> *        ...</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> *       &amp;lt;/fields&amp;gt;</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> *     &amp;lt;/table&amp;gt;</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> *     &amp;lt;table&amp;gt;</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> *       &amp;lt;name&amp;gt;documents&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> *       &amp;lt;fields&amp;gt;</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> *         &amp;lt;field&amp;gt;</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> *           &amp;lt;name&amp;gt;docid&amp;lt;/name&amp;gt;</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> *           &amp;lt;type&amp;gt;long&amp;lt;/type&amp;gt;</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> *         &amp;lt;/field&amp;gt;</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> *         ...</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> *       &amp;lt;/fields&amp;gt;</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> *     &amp;lt;/table&amp;gt;</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> *     ...</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> *   &amp;lt;/tables&amp;gt;</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * &amp;lt;/database&amp;gt;</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;&lt;p&gt;If this document is parsed and stored in a</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * {@code HierarchicalConfiguration} object (which can be done by one of</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * the sub classes), there are enhanced possibilities of accessing properties.</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> * The keys for querying information can contain indices that select a certain</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> * element if there are multiple hits.&lt;/p&gt;&lt;p&gt;For instance the key</em>
<a class="jxr_linenumber" name="90" href="#90">90</a>  <em class="jxr_javadoccomment"> * {@code tables.table(0).name} can be used to find out the name of the</em>
<a class="jxr_linenumber" name="91" href="#91">91</a>  <em class="jxr_javadoccomment"> * first table. In opposite {@code tables.table.name} would return a</em>
<a class="jxr_linenumber" name="92" href="#92">92</a>  <em class="jxr_javadoccomment"> * collection with the names of all available tables. Similarly the key</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>  <em class="jxr_javadoccomment"> * {@code tables.table(1).fields.field.name} returns a collection with</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>  <em class="jxr_javadoccomment"> * the names of all fields of the second table. If another index is added after</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>  <em class="jxr_javadoccomment"> * the {@code field} element, a single field can be accessed:</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>  <em class="jxr_javadoccomment"> * {@code tables.table(1).fields.field(0).name}.&lt;/p&gt;&lt;p&gt;There is a</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>  <em class="jxr_javadoccomment"> * {@code getMaxIndex()} method that returns the maximum allowed index</em>
<a class="jxr_linenumber" name="98" href="#98">98</a>  <em class="jxr_javadoccomment"> * that can be added to a given property key. This method can be used to iterate</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>  <em class="jxr_javadoccomment"> * over all values defined for a certain property.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * &lt;p&gt;Since the 1.3 release of &lt;em&gt;Commons Configuration&lt;/em&gt; hierarchical</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * configurations support an &lt;em&gt;expression engine&lt;/em&gt;. This expression engine</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * is responsible for evaluating the passed in configuration keys and map them</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * to the stored properties. The examples above are valid for the default</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * expression engine, which is used when a new {@code HierarchicalConfiguration}</em>
<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * instance is created. With the {@code setExpressionEngine()} method a</em>
<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * different expression engine can be set. For instance with</em>
<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * {@link org.apache.commons.configuration.tree.xpath.XPathExpressionEngine}</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * there is an expression engine available that supports configuration keys in</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * XPATH syntax.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * &lt;p&gt;In addition to the events common for all configuration classes hierarchical</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * configurations support some more events that correspond to some specific</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * methods and features:</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * &lt;dl&gt;&lt;dt&gt;&lt;em&gt;EVENT_ADD_NODES&lt;/em&gt;&lt;/dt&gt;&lt;dd&gt;The {@code addNodes()} method</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * was called; the event object contains the key, to which the nodes were added,</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> * and a collection with the new nodes as value.&lt;/dd&gt;</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * &lt;dt&gt;&lt;em&gt;EVENT_CLEAR_TREE&lt;/em&gt;&lt;/dt&gt;&lt;dd&gt;The {@code clearTree()} method was</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> * called; the event object stores the key of the removed sub tree.&lt;/dd&gt;</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * &lt;dt&gt;&lt;em&gt;EVENT_SUBNODE_CHANGED&lt;/em&gt;&lt;/dt&gt;&lt;dd&gt;A {@code SubnodeConfiguration}</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * that was created from this configuration has been changed. The value property</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * of the event object contains the original event object as it was sent by the</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * subnode configuration.&lt;/dd&gt;&lt;/dl&gt;&lt;/p&gt;</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * &lt;p&gt;&lt;em&gt;Note:&lt;/em&gt;Configuration objects of this type can be read concurrently</em>
<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * by multiple threads. However if one of these threads modifies the object,</em>
<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * synchronization has to be performed manually.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * @author Oliver Heger</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * @version $Id: HierarchicalConfiguration.java 1330666 2012-04-26 06:12:30Z oheger $</em>
<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="129" href="#129">129</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> <strong class="jxr_keyword">implements</strong> Serializable, Cloneable
<a class="jxr_linenumber" name="130" href="#130">130</a> {
<a class="jxr_linenumber" name="131" href="#131">131</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment">     * Constant for the clear tree event.</em>
<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="135" href="#135">135</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> EVENT_CLEAR_TREE = 10;
<a class="jxr_linenumber" name="136" href="#136">136</a> 
<a class="jxr_linenumber" name="137" href="#137">137</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment">     * Constant for the add nodes event.</em>
<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="141" href="#141">141</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> EVENT_ADD_NODES = 11;
<a class="jxr_linenumber" name="142" href="#142">142</a> 
<a class="jxr_linenumber" name="143" href="#143">143</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment">     * Constant for the subnode configuration modified event.</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="147" href="#147">147</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> EVENT_SUBNODE_CHANGED = 12;
<a class="jxr_linenumber" name="148" href="#148">148</a> 
<a class="jxr_linenumber" name="149" href="#149">149</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">     * The serial version UID.</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="152" href="#152">152</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 3373812230395363192L;
<a class="jxr_linenumber" name="153" href="#153">153</a> 
<a class="jxr_linenumber" name="154" href="#154">154</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the default expression engine to be used for new objects.*/</em>
<a class="jxr_linenumber" name="155" href="#155">155</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> defaultExpressionEngine;
<a class="jxr_linenumber" name="156" href="#156">156</a> 
<a class="jxr_linenumber" name="157" href="#157">157</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the root node of this configuration. This field is required for</em>
<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment">     * backwards compatibility only.</em>
<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="160" href="#160">160</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> root;
<a class="jxr_linenumber" name="161" href="#161">161</a> 
<a class="jxr_linenumber" name="162" href="#162">162</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the root configuration node.*/</em>
<a class="jxr_linenumber" name="163" href="#163">163</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> rootNode;
<a class="jxr_linenumber" name="164" href="#164">164</a> 
<a class="jxr_linenumber" name="165" href="#165">165</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the expression engine for this instance.*/</em>
<a class="jxr_linenumber" name="166" href="#166">166</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">transient</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> expressionEngine;
<a class="jxr_linenumber" name="167" href="#167">167</a> 
<a class="jxr_linenumber" name="168" href="#168">168</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="169" href="#169">169</a> <em class="jxr_javadoccomment">     * Creates a new instance of {@code HierarchicalConfiguration}.</em>
<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="171" href="#171">171</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a>()
<a class="jxr_linenumber" name="172" href="#172">172</a>     {
<a class="jxr_linenumber" name="173" href="#173">173</a>         setRootNode(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>());
<a class="jxr_linenumber" name="174" href="#174">174</a>     }
<a class="jxr_linenumber" name="175" href="#175">175</a> 
<a class="jxr_linenumber" name="176" href="#176">176</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * Creates a new instance of {@code HierarchicalConfiguration} and</em>
<a class="jxr_linenumber" name="178" href="#178">178</a> <em class="jxr_javadoccomment">     * copies all data contained in the specified configuration into the new</em>
<a class="jxr_linenumber" name="179" href="#179">179</a> <em class="jxr_javadoccomment">     * one.</em>
<a class="jxr_linenumber" name="180" href="#180">180</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="181" href="#181">181</a> <em class="jxr_javadoccomment">     * @param c the configuration that is to be copied (if &lt;b&gt;null&lt;/b&gt;, this</em>
<a class="jxr_linenumber" name="182" href="#182">182</a> <em class="jxr_javadoccomment">     * constructor will behave like the standard constructor)</em>
<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment">     * @since 1.4</em>
<a class="jxr_linenumber" name="184" href="#184">184</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="185" href="#185">185</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a>(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> c)
<a class="jxr_linenumber" name="186" href="#186">186</a>     {
<a class="jxr_linenumber" name="187" href="#187">187</a>         <strong class="jxr_keyword">this</strong>();
<a class="jxr_linenumber" name="188" href="#188">188</a>         <strong class="jxr_keyword">if</strong> (c != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="189" href="#189">189</a>         {
<a class="jxr_linenumber" name="190" href="#190">190</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a> visitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a>();
<a class="jxr_linenumber" name="191" href="#191">191</a>             c.getRootNode().visit(visitor);
<a class="jxr_linenumber" name="192" href="#192">192</a>             setRootNode(visitor.getClone());
<a class="jxr_linenumber" name="193" href="#193">193</a>         }
<a class="jxr_linenumber" name="194" href="#194">194</a>     }
<a class="jxr_linenumber" name="195" href="#195">195</a> 
<a class="jxr_linenumber" name="196" href="#196">196</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="197" href="#197">197</a> <em class="jxr_javadoccomment">     * Returns the object to synchronize on a reload. This class is not</em>
<a class="jxr_linenumber" name="198" href="#198">198</a> <em class="jxr_javadoccomment">     * reloadable so this object isn't important</em>
<a class="jxr_linenumber" name="199" href="#199">199</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="200" href="#200">200</a> <em class="jxr_javadoccomment">     * @return the lock object</em>
<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="202" href="#202">202</a>     <strong class="jxr_keyword">public</strong> Object getReloadLock()
<a class="jxr_linenumber" name="203" href="#203">203</a>     {
<a class="jxr_linenumber" name="204" href="#204">204</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a class="jxr_linenumber" name="205" href="#205">205</a>     }
<a class="jxr_linenumber" name="206" href="#206">206</a> 
<a class="jxr_linenumber" name="207" href="#207">207</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="208" href="#208">208</a> <em class="jxr_javadoccomment">     * Returns the root node of this hierarchical configuration. This method</em>
<a class="jxr_linenumber" name="209" href="#209">209</a> <em class="jxr_javadoccomment">     * exists for backwards compatibility only. New code should use the</em>
<a class="jxr_linenumber" name="210" href="#210">210</a> <em class="jxr_javadoccomment">     * {@link #getRootNode()} method instead, which operates on</em>
<a class="jxr_linenumber" name="211" href="#211">211</a> <em class="jxr_javadoccomment">     * the preferred data type {@code ConfigurationNode}.</em>
<a class="jxr_linenumber" name="212" href="#212">212</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="213" href="#213">213</a> <em class="jxr_javadoccomment">     * @return the root node</em>
<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="215" href="#215">215</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> getRoot()
<a class="jxr_linenumber" name="216" href="#216">216</a>     {
<a class="jxr_linenumber" name="217" href="#217">217</a>         <strong class="jxr_keyword">if</strong> (root == <strong class="jxr_keyword">null</strong> &amp;&amp; rootNode != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="218" href="#218">218</a>         {
<a class="jxr_linenumber" name="219" href="#219">219</a>             <em class="jxr_comment">// Dynamically create a snapshot of the root node</em>
<a class="jxr_linenumber" name="220" href="#220">220</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(rootNode);
<a class="jxr_linenumber" name="221" href="#221">221</a>         }
<a class="jxr_linenumber" name="222" href="#222">222</a> 
<a class="jxr_linenumber" name="223" href="#223">223</a>         <strong class="jxr_keyword">return</strong> root;
<a class="jxr_linenumber" name="224" href="#224">224</a>     }
<a class="jxr_linenumber" name="225" href="#225">225</a> 
<a class="jxr_linenumber" name="226" href="#226">226</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment">     * Sets the root node of this hierarchical configuration. This method</em>
<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment">     * exists for backwards compatibility only. New code should use the</em>
<a class="jxr_linenumber" name="229" href="#229">229</a> <em class="jxr_javadoccomment">     * {@link #setRootNode(ConfigurationNode)} method instead,</em>
<a class="jxr_linenumber" name="230" href="#230">230</a> <em class="jxr_javadoccomment">     * which operates on the preferred data type {@code ConfigurationNode}.</em>
<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment">     * @param node the root node</em>
<a class="jxr_linenumber" name="233" href="#233">233</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="234" href="#234">234</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setRoot(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="235" href="#235">235</a>     {
<a class="jxr_linenumber" name="236" href="#236">236</a>         <strong class="jxr_keyword">if</strong> (node == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="237" href="#237">237</a>         {
<a class="jxr_linenumber" name="238" href="#238">238</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Root node must not be null!"</span>);
<a class="jxr_linenumber" name="239" href="#239">239</a>         }
<a class="jxr_linenumber" name="240" href="#240">240</a>         root = node;
<a class="jxr_linenumber" name="241" href="#241">241</a>         rootNode = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="242" href="#242">242</a>     }
<a class="jxr_linenumber" name="243" href="#243">243</a> 
<a class="jxr_linenumber" name="244" href="#244">244</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_javadoccomment">     * Returns the root node of this hierarchical configuration.</em>
<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="247" href="#247">247</a> <em class="jxr_javadoccomment">     * @return the root node</em>
<a class="jxr_linenumber" name="248" href="#248">248</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="250" href="#250">250</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> getRootNode()
<a class="jxr_linenumber" name="251" href="#251">251</a>     {
<a class="jxr_linenumber" name="252" href="#252">252</a>         <strong class="jxr_keyword">return</strong> (rootNode != <strong class="jxr_keyword">null</strong>) ? rootNode : root;
<a class="jxr_linenumber" name="253" href="#253">253</a>     }
<a class="jxr_linenumber" name="254" href="#254">254</a> 
<a class="jxr_linenumber" name="255" href="#255">255</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="256" href="#256">256</a> <em class="jxr_javadoccomment">     * Sets the root node of this hierarchical configuration.</em>
<a class="jxr_linenumber" name="257" href="#257">257</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="258" href="#258">258</a> <em class="jxr_javadoccomment">     * @param rootNode the root node</em>
<a class="jxr_linenumber" name="259" href="#259">259</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="260" href="#260">260</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="261" href="#261">261</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setRootNode(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> rootNode)
<a class="jxr_linenumber" name="262" href="#262">262</a>     {
<a class="jxr_linenumber" name="263" href="#263">263</a>         <strong class="jxr_keyword">if</strong> (rootNode == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="264" href="#264">264</a>         {
<a class="jxr_linenumber" name="265" href="#265">265</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Root node must not be null!"</span>);
<a class="jxr_linenumber" name="266" href="#266">266</a>         }
<a class="jxr_linenumber" name="267" href="#267">267</a>         <strong class="jxr_keyword">this</strong>.rootNode = rootNode;
<a class="jxr_linenumber" name="268" href="#268">268</a> 
<a class="jxr_linenumber" name="269" href="#269">269</a>         <em class="jxr_comment">// For backward compatibility also set the old root field.</em>
<a class="jxr_linenumber" name="270" href="#270">270</a>         root = (rootNode instanceof Node) ? (Node) rootNode : <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="271" href="#271">271</a>     }
<a class="jxr_linenumber" name="272" href="#272">272</a> 
<a class="jxr_linenumber" name="273" href="#273">273</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="274" href="#274">274</a> <em class="jxr_javadoccomment">     * Returns the default expression engine.</em>
<a class="jxr_linenumber" name="275" href="#275">275</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * @return the default expression engine</em>
<a class="jxr_linenumber" name="277" href="#277">277</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="278" href="#278">278</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="279" href="#279">279</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">synchronized</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> getDefaultExpressionEngine()
<a class="jxr_linenumber" name="280" href="#280">280</a>     {
<a class="jxr_linenumber" name="281" href="#281">281</a>         <strong class="jxr_keyword">if</strong> (defaultExpressionEngine == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="282" href="#282">282</a>         {
<a class="jxr_linenumber" name="283" href="#283">283</a>             defaultExpressionEngine = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultExpressionEngine.html">DefaultExpressionEngine</a>();
<a class="jxr_linenumber" name="284" href="#284">284</a>         }
<a class="jxr_linenumber" name="285" href="#285">285</a>         <strong class="jxr_keyword">return</strong> defaultExpressionEngine;
<a class="jxr_linenumber" name="286" href="#286">286</a>     }
<a class="jxr_linenumber" name="287" href="#287">287</a> 
<a class="jxr_linenumber" name="288" href="#288">288</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="289" href="#289">289</a> <em class="jxr_javadoccomment">     * Sets the default expression engine. This expression engine will be used</em>
<a class="jxr_linenumber" name="290" href="#290">290</a> <em class="jxr_javadoccomment">     * if no specific engine was set for an instance. It is shared between all</em>
<a class="jxr_linenumber" name="291" href="#291">291</a> <em class="jxr_javadoccomment">     * hierarchical configuration instances. So modifying its properties will</em>
<a class="jxr_linenumber" name="292" href="#292">292</a> <em class="jxr_javadoccomment">     * impact all instances, for which no specific engine is set.</em>
<a class="jxr_linenumber" name="293" href="#293">293</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="294" href="#294">294</a> <em class="jxr_javadoccomment">     * @param engine the new default expression engine</em>
<a class="jxr_linenumber" name="295" href="#295">295</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="296" href="#296">296</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="297" href="#297">297</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">synchronized</strong> <strong class="jxr_keyword">void</strong> setDefaultExpressionEngine(<a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> engine)
<a class="jxr_linenumber" name="298" href="#298">298</a>     {
<a class="jxr_linenumber" name="299" href="#299">299</a>         <strong class="jxr_keyword">if</strong> (engine == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="300" href="#300">300</a>         {
<a class="jxr_linenumber" name="301" href="#301">301</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="302" href="#302">302</a>                     <span class="jxr_string">"Default expression engine must not be null!"</span>);
<a class="jxr_linenumber" name="303" href="#303">303</a>         }
<a class="jxr_linenumber" name="304" href="#304">304</a>         defaultExpressionEngine = engine;
<a class="jxr_linenumber" name="305" href="#305">305</a>     }
<a class="jxr_linenumber" name="306" href="#306">306</a> 
<a class="jxr_linenumber" name="307" href="#307">307</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment">     * Returns the expression engine used by this configuration. This method</em>
<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment">     * will never return &lt;b&gt;null&lt;/b&gt;; if no specific expression engine was set,</em>
<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment">     * the default expression engine will be returned.</em>
<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="312" href="#312">312</a> <em class="jxr_javadoccomment">     * @return the current expression engine</em>
<a class="jxr_linenumber" name="313" href="#313">313</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="314" href="#314">314</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="315" href="#315">315</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> getExpressionEngine()
<a class="jxr_linenumber" name="316" href="#316">316</a>     {
<a class="jxr_linenumber" name="317" href="#317">317</a>         <strong class="jxr_keyword">return</strong> (expressionEngine != <strong class="jxr_keyword">null</strong>) ? expressionEngine
<a class="jxr_linenumber" name="318" href="#318">318</a>                 : getDefaultExpressionEngine();
<a class="jxr_linenumber" name="319" href="#319">319</a>     }
<a class="jxr_linenumber" name="320" href="#320">320</a> 
<a class="jxr_linenumber" name="321" href="#321">321</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="322" href="#322">322</a> <em class="jxr_javadoccomment">     * Sets the expression engine to be used by this configuration. All property</em>
<a class="jxr_linenumber" name="323" href="#323">323</a> <em class="jxr_javadoccomment">     * keys this configuration has to deal with will be interpreted by this</em>
<a class="jxr_linenumber" name="324" href="#324">324</a> <em class="jxr_javadoccomment">     * engine.</em>
<a class="jxr_linenumber" name="325" href="#325">325</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="326" href="#326">326</a> <em class="jxr_javadoccomment">     * @param expressionEngine the new expression engine; can be &lt;b&gt;null&lt;/b&gt;,</em>
<a class="jxr_linenumber" name="327" href="#327">327</a> <em class="jxr_javadoccomment">     * then the default expression engine will be used</em>
<a class="jxr_linenumber" name="328" href="#328">328</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="329" href="#329">329</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="330" href="#330">330</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setExpressionEngine(<a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> expressionEngine)
<a class="jxr_linenumber" name="331" href="#331">331</a>     {
<a class="jxr_linenumber" name="332" href="#332">332</a>         <strong class="jxr_keyword">this</strong>.expressionEngine = expressionEngine;
<a class="jxr_linenumber" name="333" href="#333">333</a>     }
<a class="jxr_linenumber" name="334" href="#334">334</a> 
<a class="jxr_linenumber" name="335" href="#335">335</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="336" href="#336">336</a> <em class="jxr_javadoccomment">     * Fetches the specified property. This task is delegated to the associated</em>
<a class="jxr_linenumber" name="337" href="#337">337</a> <em class="jxr_javadoccomment">     * expression engine.</em>
<a class="jxr_linenumber" name="338" href="#338">338</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="339" href="#339">339</a> <em class="jxr_javadoccomment">     * @param key the key to be looked up</em>
<a class="jxr_linenumber" name="340" href="#340">340</a> <em class="jxr_javadoccomment">     * @return the found value</em>
<a class="jxr_linenumber" name="341" href="#341">341</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="342" href="#342">342</a>     <strong class="jxr_keyword">public</strong> Object getProperty(String key)
<a class="jxr_linenumber" name="343" href="#343">343</a>     {
<a class="jxr_linenumber" name="344" href="#344">344</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="345" href="#345">345</a> 
<a class="jxr_linenumber" name="346" href="#346">346</a>         <strong class="jxr_keyword">if</strong> (nodes.size() == 0)
<a class="jxr_linenumber" name="347" href="#347">347</a>         {
<a class="jxr_linenumber" name="348" href="#348">348</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="349" href="#349">349</a>         }
<a class="jxr_linenumber" name="350" href="#350">350</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="351" href="#351">351</a>         {
<a class="jxr_linenumber" name="352" href="#352">352</a>             List&lt;Object&gt; list = <strong class="jxr_keyword">new</strong> ArrayList&lt;Object&gt;();
<a class="jxr_linenumber" name="353" href="#353">353</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode node : nodes)
<a class="jxr_linenumber" name="354" href="#354">354</a>             {
<a class="jxr_linenumber" name="355" href="#355">355</a>                 <strong class="jxr_keyword">if</strong> (node.getValue() != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="356" href="#356">356</a>                 {
<a class="jxr_linenumber" name="357" href="#357">357</a>                     list.add(node.getValue());
<a class="jxr_linenumber" name="358" href="#358">358</a>                 }
<a class="jxr_linenumber" name="359" href="#359">359</a>             }
<a class="jxr_linenumber" name="360" href="#360">360</a> 
<a class="jxr_linenumber" name="361" href="#361">361</a>             <strong class="jxr_keyword">if</strong> (list.size() &lt; 1)
<a class="jxr_linenumber" name="362" href="#362">362</a>             {
<a class="jxr_linenumber" name="363" href="#363">363</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="364" href="#364">364</a>             }
<a class="jxr_linenumber" name="365" href="#365">365</a>             <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="366" href="#366">366</a>             {
<a class="jxr_linenumber" name="367" href="#367">367</a>                 <strong class="jxr_keyword">return</strong> (list.size() == 1) ? list.get(0) : list;
<a class="jxr_linenumber" name="368" href="#368">368</a>             }
<a class="jxr_linenumber" name="369" href="#369">369</a>         }
<a class="jxr_linenumber" name="370" href="#370">370</a>     }
<a class="jxr_linenumber" name="371" href="#371">371</a> 
<a class="jxr_linenumber" name="372" href="#372">372</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="373" href="#373">373</a> <em class="jxr_javadoccomment">     * Adds the property with the specified key. This task will be delegated to</em>
<a class="jxr_linenumber" name="374" href="#374">374</a> <em class="jxr_javadoccomment">     * the associated {@code ExpressionEngine}, so the passed in key</em>
<a class="jxr_linenumber" name="375" href="#375">375</a> <em class="jxr_javadoccomment">     * must match the requirements of this implementation.</em>
<a class="jxr_linenumber" name="376" href="#376">376</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="377" href="#377">377</a> <em class="jxr_javadoccomment">     * @param key the key of the new property</em>
<a class="jxr_linenumber" name="378" href="#378">378</a> <em class="jxr_javadoccomment">     * @param obj the value of the new property</em>
<a class="jxr_linenumber" name="379" href="#379">379</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="380" href="#380">380</a>     @Override
<a class="jxr_linenumber" name="381" href="#381">381</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> addPropertyDirect(String key, Object obj)
<a class="jxr_linenumber" name="382" href="#382">382</a>     {
<a class="jxr_linenumber" name="383" href="#383">383</a>         <a href="../../../../org/apache/commons/configuration/tree/NodeAddData.html">NodeAddData</a> data = getExpressionEngine().prepareAdd(getRootNode(), key);
<a class="jxr_linenumber" name="384" href="#384">384</a>         <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node = processNodeAddData(data);
<a class="jxr_linenumber" name="385" href="#385">385</a>         node.setValue(obj);
<a class="jxr_linenumber" name="386" href="#386">386</a>     }
<a class="jxr_linenumber" name="387" href="#387">387</a> 
<a class="jxr_linenumber" name="388" href="#388">388</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="389" href="#389">389</a> <em class="jxr_javadoccomment">     * Adds a collection of nodes at the specified position of the configuration</em>
<a class="jxr_linenumber" name="390" href="#390">390</a> <em class="jxr_javadoccomment">     * tree. This method works similar to {@code addProperty()}, but</em>
<a class="jxr_linenumber" name="391" href="#391">391</a> <em class="jxr_javadoccomment">     * instead of a single property a whole collection of nodes can be added -</em>
<a class="jxr_linenumber" name="392" href="#392">392</a> <em class="jxr_javadoccomment">     * and thus complete configuration sub trees. E.g. with this method it is</em>
<a class="jxr_linenumber" name="393" href="#393">393</a> <em class="jxr_javadoccomment">     * possible to add parts of another {@code HierarchicalConfiguration}</em>
<a class="jxr_linenumber" name="394" href="#394">394</a> <em class="jxr_javadoccomment">     * object to this object. (However be aware that a</em>
<a class="jxr_linenumber" name="395" href="#395">395</a> <em class="jxr_javadoccomment">     * {@code ConfigurationNode} object can only belong to a single</em>
<a class="jxr_linenumber" name="396" href="#396">396</a> <em class="jxr_javadoccomment">     * configuration. So if nodes from one configuration are directly added to</em>
<a class="jxr_linenumber" name="397" href="#397">397</a> <em class="jxr_javadoccomment">     * another one using this method, the structure of the source configuration</em>
<a class="jxr_linenumber" name="398" href="#398">398</a> <em class="jxr_javadoccomment">     * will be broken. In this case you should clone the nodes to be added</em>
<a class="jxr_linenumber" name="399" href="#399">399</a> <em class="jxr_javadoccomment">     * before calling {@code addNodes()}.) If the passed in key refers to</em>
<a class="jxr_linenumber" name="400" href="#400">400</a> <em class="jxr_javadoccomment">     * an existing and unique node, the new nodes are added to this node.</em>
<a class="jxr_linenumber" name="401" href="#401">401</a> <em class="jxr_javadoccomment">     * Otherwise a new node will be created at the specified position in the</em>
<a class="jxr_linenumber" name="402" href="#402">402</a> <em class="jxr_javadoccomment">     * hierarchy.</em>
<a class="jxr_linenumber" name="403" href="#403">403</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="404" href="#404">404</a> <em class="jxr_javadoccomment">     * @param key the key where the nodes are to be added; can be &lt;b&gt;null &lt;/b&gt;,</em>
<a class="jxr_linenumber" name="405" href="#405">405</a> <em class="jxr_javadoccomment">     * then they are added to the root node</em>
<a class="jxr_linenumber" name="406" href="#406">406</a> <em class="jxr_javadoccomment">     * @param nodes a collection with the {@code Node} objects to be</em>
<a class="jxr_linenumber" name="407" href="#407">407</a> <em class="jxr_javadoccomment">     * added</em>
<a class="jxr_linenumber" name="408" href="#408">408</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="409" href="#409">409</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addNodes(String key, Collection&lt;? <strong class="jxr_keyword">extends</strong> ConfigurationNode&gt; nodes)
<a class="jxr_linenumber" name="410" href="#410">410</a>     {
<a class="jxr_linenumber" name="411" href="#411">411</a>         <strong class="jxr_keyword">if</strong> (nodes == <strong class="jxr_keyword">null</strong> || nodes.isEmpty())
<a class="jxr_linenumber" name="412" href="#412">412</a>         {
<a class="jxr_linenumber" name="413" href="#413">413</a>             <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="414" href="#414">414</a>         }
<a class="jxr_linenumber" name="415" href="#415">415</a> 
<a class="jxr_linenumber" name="416" href="#416">416</a>         fireEvent(EVENT_ADD_NODES, key, nodes, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="417" href="#417">417</a>         <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> parent;
<a class="jxr_linenumber" name="418" href="#418">418</a>         List&lt;ConfigurationNode&gt; target = fetchNodeList(key);
<a class="jxr_linenumber" name="419" href="#419">419</a>         <strong class="jxr_keyword">if</strong> (target.size() == 1)
<a class="jxr_linenumber" name="420" href="#420">420</a>         {
<a class="jxr_linenumber" name="421" href="#421">421</a>             <em class="jxr_comment">// existing unique key</em>
<a class="jxr_linenumber" name="422" href="#422">422</a>             parent = target.get(0);
<a class="jxr_linenumber" name="423" href="#423">423</a>         }
<a class="jxr_linenumber" name="424" href="#424">424</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="425" href="#425">425</a>         {
<a class="jxr_linenumber" name="426" href="#426">426</a>             <em class="jxr_comment">// otherwise perform an add operation</em>
<a class="jxr_linenumber" name="427" href="#427">427</a>             parent = processNodeAddData(getExpressionEngine().prepareAdd(
<a class="jxr_linenumber" name="428" href="#428">428</a>                     getRootNode(), key));
<a class="jxr_linenumber" name="429" href="#429">429</a>         }
<a class="jxr_linenumber" name="430" href="#430">430</a> 
<a class="jxr_linenumber" name="431" href="#431">431</a>         <strong class="jxr_keyword">if</strong> (parent.isAttribute())
<a class="jxr_linenumber" name="432" href="#432">432</a>         {
<a class="jxr_linenumber" name="433" href="#433">433</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="434" href="#434">434</a>                     <span class="jxr_string">"Cannot add nodes to an attribute node!"</span>);
<a class="jxr_linenumber" name="435" href="#435">435</a>         }
<a class="jxr_linenumber" name="436" href="#436">436</a> 
<a class="jxr_linenumber" name="437" href="#437">437</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode child : nodes)
<a class="jxr_linenumber" name="438" href="#438">438</a>         {
<a class="jxr_linenumber" name="439" href="#439">439</a>             <strong class="jxr_keyword">if</strong> (child.isAttribute())
<a class="jxr_linenumber" name="440" href="#440">440</a>             {
<a class="jxr_linenumber" name="441" href="#441">441</a>                 parent.addAttribute(child);
<a class="jxr_linenumber" name="442" href="#442">442</a>             }
<a class="jxr_linenumber" name="443" href="#443">443</a>             <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="444" href="#444">444</a>             {
<a class="jxr_linenumber" name="445" href="#445">445</a>                 parent.addChild(child);
<a class="jxr_linenumber" name="446" href="#446">446</a>             }
<a class="jxr_linenumber" name="447" href="#447">447</a>             clearReferences(child);
<a class="jxr_linenumber" name="448" href="#448">448</a>         }
<a class="jxr_linenumber" name="449" href="#449">449</a>         fireEvent(EVENT_ADD_NODES, key, nodes, false);
<a class="jxr_linenumber" name="450" href="#450">450</a>     }
<a class="jxr_linenumber" name="451" href="#451">451</a> 
<a class="jxr_linenumber" name="452" href="#452">452</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="453" href="#453">453</a> <em class="jxr_javadoccomment">     * Checks if this configuration is empty. Empty means that there are no keys</em>
<a class="jxr_linenumber" name="454" href="#454">454</a> <em class="jxr_javadoccomment">     * with any values, though there can be some (empty) nodes.</em>
<a class="jxr_linenumber" name="455" href="#455">455</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="456" href="#456">456</a> <em class="jxr_javadoccomment">     * @return a flag if this configuration is empty</em>
<a class="jxr_linenumber" name="457" href="#457">457</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="458" href="#458">458</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isEmpty()
<a class="jxr_linenumber" name="459" href="#459">459</a>     {
<a class="jxr_linenumber" name="460" href="#460">460</a>         <strong class="jxr_keyword">return</strong> !nodeDefined(getRootNode());
<a class="jxr_linenumber" name="461" href="#461">461</a>     }
<a class="jxr_linenumber" name="462" href="#462">462</a> 
<a class="jxr_linenumber" name="463" href="#463">463</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="464" href="#464">464</a> <em class="jxr_javadoccomment">     * Creates a new {@code Configuration} object containing all keys</em>
<a class="jxr_linenumber" name="465" href="#465">465</a> <em class="jxr_javadoccomment">     * that start with the specified prefix. This implementation will return a</em>
<a class="jxr_linenumber" name="466" href="#466">466</a> <em class="jxr_javadoccomment">     * {@code HierarchicalConfiguration} object so that the structure of</em>
<a class="jxr_linenumber" name="467" href="#467">467</a> <em class="jxr_javadoccomment">     * the keys will be saved. The nodes selected by the prefix (it is possible</em>
<a class="jxr_linenumber" name="468" href="#468">468</a> <em class="jxr_javadoccomment">     * that multiple nodes are selected) are mapped to the root node of the</em>
<a class="jxr_linenumber" name="469" href="#469">469</a> <em class="jxr_javadoccomment">     * returned configuration, i.e. their children and attributes will become</em>
<a class="jxr_linenumber" name="470" href="#470">470</a> <em class="jxr_javadoccomment">     * children and attributes of the new root node. However a value of the root</em>
<a class="jxr_linenumber" name="471" href="#471">471</a> <em class="jxr_javadoccomment">     * node is only set if exactly one of the selected nodes contain a value (if</em>
<a class="jxr_linenumber" name="472" href="#472">472</a> <em class="jxr_javadoccomment">     * multiple nodes have a value, there is simply no way to decide how these</em>
<a class="jxr_linenumber" name="473" href="#473">473</a> <em class="jxr_javadoccomment">     * values are merged together). Note that the returned</em>
<a class="jxr_linenumber" name="474" href="#474">474</a> <em class="jxr_javadoccomment">     * {@code Configuration} object is not connected to its source</em>
<a class="jxr_linenumber" name="475" href="#475">475</a> <em class="jxr_javadoccomment">     * configuration: updates on the source configuration are not reflected in</em>
<a class="jxr_linenumber" name="476" href="#476">476</a> <em class="jxr_javadoccomment">     * the subset and vice versa.</em>
<a class="jxr_linenumber" name="477" href="#477">477</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="478" href="#478">478</a> <em class="jxr_javadoccomment">     * @param prefix the prefix of the keys for the subset</em>
<a class="jxr_linenumber" name="479" href="#479">479</a> <em class="jxr_javadoccomment">     * @return a new configuration object representing the selected subset</em>
<a class="jxr_linenumber" name="480" href="#480">480</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="481" href="#481">481</a>     @Override
<a class="jxr_linenumber" name="482" href="#482">482</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> subset(String prefix)
<a class="jxr_linenumber" name="483" href="#483">483</a>     {
<a class="jxr_linenumber" name="484" href="#484">484</a>         Collection&lt;ConfigurationNode&gt; nodes = fetchNodeList(prefix);
<a class="jxr_linenumber" name="485" href="#485">485</a>         <strong class="jxr_keyword">if</strong> (nodes.isEmpty())
<a class="jxr_linenumber" name="486" href="#486">486</a>         {
<a class="jxr_linenumber" name="487" href="#487">487</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a>();
<a class="jxr_linenumber" name="488" href="#488">488</a>         }
<a class="jxr_linenumber" name="489" href="#489">489</a> 
<a class="jxr_linenumber" name="490" href="#490">490</a>         <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> parent = <strong class="jxr_keyword">this</strong>;
<a class="jxr_linenumber" name="491" href="#491">491</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> result = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a>()
<a class="jxr_linenumber" name="492" href="#492">492</a>         {
<a class="jxr_linenumber" name="493" href="#493">493</a>             <em class="jxr_comment">// Override interpolate to always interpolate on the parent</em>
<a class="jxr_linenumber" name="494" href="#494">494</a>             @Override
<a class="jxr_linenumber" name="495" href="#495">495</a>             <strong class="jxr_keyword">protected</strong> Object interpolate(Object value)
<a class="jxr_linenumber" name="496" href="#496">496</a>             {
<a class="jxr_linenumber" name="497" href="#497">497</a>                 <strong class="jxr_keyword">return</strong> parent.interpolate(value);
<a class="jxr_linenumber" name="498" href="#498">498</a>             }
<a class="jxr_linenumber" name="499" href="#499">499</a>         };
<a class="jxr_linenumber" name="500" href="#500">500</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a> visitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a>();
<a class="jxr_linenumber" name="501" href="#501">501</a> 
<a class="jxr_linenumber" name="502" href="#502">502</a>         <em class="jxr_comment">// Initialize the new root node</em>
<a class="jxr_linenumber" name="503" href="#503">503</a>         Object value = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="504" href="#504">504</a>         <strong class="jxr_keyword">int</strong> valueCount = 0;
<a class="jxr_linenumber" name="505" href="#505">505</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode nd : nodes)
<a class="jxr_linenumber" name="506" href="#506">506</a>         {
<a class="jxr_linenumber" name="507" href="#507">507</a>             <strong class="jxr_keyword">if</strong> (nd.getValue() != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="508" href="#508">508</a>             {
<a class="jxr_linenumber" name="509" href="#509">509</a>                 value = nd.getValue();
<a class="jxr_linenumber" name="510" href="#510">510</a>                 valueCount++;
<a class="jxr_linenumber" name="511" href="#511">511</a>             }
<a class="jxr_linenumber" name="512" href="#512">512</a>             nd.visit(visitor);
<a class="jxr_linenumber" name="513" href="#513">513</a> 
<a class="jxr_linenumber" name="514" href="#514">514</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode c : visitor.getClone().getChildren())
<a class="jxr_linenumber" name="515" href="#515">515</a>             {
<a class="jxr_linenumber" name="516" href="#516">516</a>                 result.getRootNode().addChild(c);
<a class="jxr_linenumber" name="517" href="#517">517</a>             }
<a class="jxr_linenumber" name="518" href="#518">518</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode attr : visitor.getClone().getAttributes())
<a class="jxr_linenumber" name="519" href="#519">519</a>             {
<a class="jxr_linenumber" name="520" href="#520">520</a>                 result.getRootNode().addAttribute(attr);
<a class="jxr_linenumber" name="521" href="#521">521</a>             }
<a class="jxr_linenumber" name="522" href="#522">522</a>         }
<a class="jxr_linenumber" name="523" href="#523">523</a> 
<a class="jxr_linenumber" name="524" href="#524">524</a>         <em class="jxr_comment">// Determine the value of the new root</em>
<a class="jxr_linenumber" name="525" href="#525">525</a>         <strong class="jxr_keyword">if</strong> (valueCount == 1)
<a class="jxr_linenumber" name="526" href="#526">526</a>         {
<a class="jxr_linenumber" name="527" href="#527">527</a>             result.getRootNode().setValue(value);
<a class="jxr_linenumber" name="528" href="#528">528</a>         }
<a class="jxr_linenumber" name="529" href="#529">529</a>         <strong class="jxr_keyword">return</strong> (result.isEmpty()) ? <strong class="jxr_keyword">new</strong> HierarchicalConfiguration() : result;
<a class="jxr_linenumber" name="530" href="#530">530</a>     }
<a class="jxr_linenumber" name="531" href="#531">531</a> 
<a class="jxr_linenumber" name="532" href="#532">532</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="533" href="#533">533</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a class="jxr_linenumber" name="534" href="#534">534</a> <em class="jxr_javadoccomment">     * Returns a hierarchical subnode configuration object that wraps the</em>
<a class="jxr_linenumber" name="535" href="#535">535</a> <em class="jxr_javadoccomment">     * configuration node specified by the given key. This method provides an</em>
<a class="jxr_linenumber" name="536" href="#536">536</a> <em class="jxr_javadoccomment">     * easy means of accessing sub trees of a hierarchical configuration. In the</em>
<a class="jxr_linenumber" name="537" href="#537">537</a> <em class="jxr_javadoccomment">     * returned configuration the sub tree can directly be accessed, it becomes</em>
<a class="jxr_linenumber" name="538" href="#538">538</a> <em class="jxr_javadoccomment">     * the root node of this configuration. Because of this the passed in key</em>
<a class="jxr_linenumber" name="539" href="#539">539</a> <em class="jxr_javadoccomment">     * must select exactly one configuration node; otherwise an</em>
<a class="jxr_linenumber" name="540" href="#540">540</a> <em class="jxr_javadoccomment">     * {@code IllegalArgumentException} will be thrown.</em>
<a class="jxr_linenumber" name="541" href="#541">541</a> <em class="jxr_javadoccomment">     * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="542" href="#542">542</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a class="jxr_linenumber" name="543" href="#543">543</a> <em class="jxr_javadoccomment">     * The difference between this method and the</em>
<a class="jxr_linenumber" name="544" href="#544">544</a> <em class="jxr_javadoccomment">     * {@link #subset(String)} method is that</em>
<a class="jxr_linenumber" name="545" href="#545">545</a> <em class="jxr_javadoccomment">     * {@code subset()} supports arbitrary subsets of configuration nodes</em>
<a class="jxr_linenumber" name="546" href="#546">546</a> <em class="jxr_javadoccomment">     * while {@code configurationAt()} only returns a single sub tree.</em>
<a class="jxr_linenumber" name="547" href="#547">547</a> <em class="jxr_javadoccomment">     * Please refer to the documentation of the</em>
<a class="jxr_linenumber" name="548" href="#548">548</a> <em class="jxr_javadoccomment">     * {@code SubnodeConfiguration} class to obtain further information</em>
<a class="jxr_linenumber" name="549" href="#549">549</a> <em class="jxr_javadoccomment">     * about subnode configurations and when they should be used.</em>
<a class="jxr_linenumber" name="550" href="#550">550</a> <em class="jxr_javadoccomment">     * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="551" href="#551">551</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a class="jxr_linenumber" name="552" href="#552">552</a> <em class="jxr_javadoccomment">     * With the {@code supportUpdate} flag the behavior of the returned</em>
<a class="jxr_linenumber" name="553" href="#553">553</a> <em class="jxr_javadoccomment">     * {@code SubnodeConfiguration} regarding updates of its parent</em>
<a class="jxr_linenumber" name="554" href="#554">554</a> <em class="jxr_javadoccomment">     * configuration can be determined. A subnode configuration operates on the</em>
<a class="jxr_linenumber" name="555" href="#555">555</a> <em class="jxr_javadoccomment">     * same nodes as its parent, so changes at one configuration are normally</em>
<a class="jxr_linenumber" name="556" href="#556">556</a> <em class="jxr_javadoccomment">     * directly visible for the other configuration. There are however changes</em>
<a class="jxr_linenumber" name="557" href="#557">557</a> <em class="jxr_javadoccomment">     * of the parent configuration, which are not recognized by the subnode</em>
<a class="jxr_linenumber" name="558" href="#558">558</a> <em class="jxr_javadoccomment">     * configuration per default. An example for this is a reload operation (for</em>
<a class="jxr_linenumber" name="559" href="#559">559</a> <em class="jxr_javadoccomment">     * file-based configurations): Here the complete node set of the parent</em>
<a class="jxr_linenumber" name="560" href="#560">560</a> <em class="jxr_javadoccomment">     * configuration is replaced, but the subnode configuration still references</em>
<a class="jxr_linenumber" name="561" href="#561">561</a> <em class="jxr_javadoccomment">     * the old nodes. If such changes should be detected by the subnode</em>
<a class="jxr_linenumber" name="562" href="#562">562</a> <em class="jxr_javadoccomment">     * configuration, the {@code supportUpdates} flag must be set to</em>
<a class="jxr_linenumber" name="563" href="#563">563</a> <em class="jxr_javadoccomment">     * &lt;b&gt;true&lt;/b&gt;. This causes the subnode configuration to reevaluate the key</em>
<a class="jxr_linenumber" name="564" href="#564">564</a> <em class="jxr_javadoccomment">     * used for its creation each time it is accessed. This guarantees that the</em>
<a class="jxr_linenumber" name="565" href="#565">565</a> <em class="jxr_javadoccomment">     * subnode configuration always stays in sync with its key, even if the</em>
<a class="jxr_linenumber" name="566" href="#566">566</a> <em class="jxr_javadoccomment">     * parent configuration's data significantly changes. If such a change</em>
<a class="jxr_linenumber" name="567" href="#567">567</a> <em class="jxr_javadoccomment">     * makes the key invalid - because it now no longer points to exactly one</em>
<a class="jxr_linenumber" name="568" href="#568">568</a> <em class="jxr_javadoccomment">     * node -, the subnode configuration is not reconstructed, but keeps its</em>
<a class="jxr_linenumber" name="569" href="#569">569</a> <em class="jxr_javadoccomment">     * old data. It is then quasi detached from its parent.</em>
<a class="jxr_linenumber" name="570" href="#570">570</a> <em class="jxr_javadoccomment">     * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="571" href="#571">571</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="572" href="#572">572</a> <em class="jxr_javadoccomment">     * @param key the key that selects the sub tree</em>
<a class="jxr_linenumber" name="573" href="#573">573</a> <em class="jxr_javadoccomment">     * @param supportUpdates a flag whether the returned subnode configuration</em>
<a class="jxr_linenumber" name="574" href="#574">574</a> <em class="jxr_javadoccomment">     * should be able to handle updates of its parent</em>
<a class="jxr_linenumber" name="575" href="#575">575</a> <em class="jxr_javadoccomment">     * @return a hierarchical configuration that contains this sub tree</em>
<a class="jxr_linenumber" name="576" href="#576">576</a> <em class="jxr_javadoccomment">     * @see SubnodeConfiguration</em>
<a class="jxr_linenumber" name="577" href="#577">577</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="578" href="#578">578</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="579" href="#579">579</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> configurationAt(String key,
<a class="jxr_linenumber" name="580" href="#580">580</a>             <strong class="jxr_keyword">boolean</strong> supportUpdates)
<a class="jxr_linenumber" name="581" href="#581">581</a>     {
<a class="jxr_linenumber" name="582" href="#582">582</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="583" href="#583">583</a>         <strong class="jxr_keyword">if</strong> (nodes.size() != 1)
<a class="jxr_linenumber" name="584" href="#584">584</a>         {
<a class="jxr_linenumber" name="585" href="#585">585</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="586" href="#586">586</a>                     <span class="jxr_string">"Passed in key must select exactly one node: "</span> + key);
<a class="jxr_linenumber" name="587" href="#587">587</a>         }
<a class="jxr_linenumber" name="588" href="#588">588</a>         <strong class="jxr_keyword">return</strong> supportUpdates ? createSubnodeConfiguration(
<a class="jxr_linenumber" name="589" href="#589">589</a>                 nodes.get(0), key)
<a class="jxr_linenumber" name="590" href="#590">590</a>                 : createSubnodeConfiguration(nodes.get(0));
<a class="jxr_linenumber" name="591" href="#591">591</a>     }
<a class="jxr_linenumber" name="592" href="#592">592</a> 
<a class="jxr_linenumber" name="593" href="#593">593</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="594" href="#594">594</a> <em class="jxr_javadoccomment">     * Returns a hierarchical subnode configuration for the node specified by</em>
<a class="jxr_linenumber" name="595" href="#595">595</a> <em class="jxr_javadoccomment">     * the given key. This is a short form for {@code configurationAt(key,</em>
<a class="jxr_linenumber" name="596" href="#596">596</a> <em class="jxr_javadoccomment">     * &lt;b&gt;false&lt;/b&gt;)}.</em>
<a class="jxr_linenumber" name="597" href="#597">597</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="598" href="#598">598</a> <em class="jxr_javadoccomment">     * @param key the key that selects the sub tree</em>
<a class="jxr_linenumber" name="599" href="#599">599</a> <em class="jxr_javadoccomment">     * @return a hierarchical configuration that contains this sub tree</em>
<a class="jxr_linenumber" name="600" href="#600">600</a> <em class="jxr_javadoccomment">     * @see SubnodeConfiguration</em>
<a class="jxr_linenumber" name="601" href="#601">601</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="602" href="#602">602</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="603" href="#603">603</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> configurationAt(String key)
<a class="jxr_linenumber" name="604" href="#604">604</a>     {
<a class="jxr_linenumber" name="605" href="#605">605</a>         <strong class="jxr_keyword">return</strong> configurationAt(key, false);
<a class="jxr_linenumber" name="606" href="#606">606</a>     }
<a class="jxr_linenumber" name="607" href="#607">607</a> 
<a class="jxr_linenumber" name="608" href="#608">608</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="609" href="#609">609</a> <em class="jxr_javadoccomment">     * Returns a list of sub configurations for all configuration nodes selected</em>
<a class="jxr_linenumber" name="610" href="#610">610</a> <em class="jxr_javadoccomment">     * by the given key. This method will evaluate the passed in key (using the</em>
<a class="jxr_linenumber" name="611" href="#611">611</a> <em class="jxr_javadoccomment">     * current {@code ExpressionEngine}) and then create a subnode</em>
<a class="jxr_linenumber" name="612" href="#612">612</a> <em class="jxr_javadoccomment">     * configuration for each returned node (like</em>
<a class="jxr_linenumber" name="613" href="#613">613</a> <em class="jxr_javadoccomment">     * {@link #configurationAt(String)}}). This is especially</em>
<a class="jxr_linenumber" name="614" href="#614">614</a> <em class="jxr_javadoccomment">     * useful when dealing with list-like structures. As an example consider the</em>
<a class="jxr_linenumber" name="615" href="#615">615</a> <em class="jxr_javadoccomment">     * configuration that contains data about database tables and their fields.</em>
<a class="jxr_linenumber" name="616" href="#616">616</a> <em class="jxr_javadoccomment">     * If you need access to all fields of a certain table, you can simply do</em>
<a class="jxr_linenumber" name="617" href="#617">617</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="618" href="#618">618</a> <em class="jxr_javadoccomment">     * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="619" href="#619">619</a> <em class="jxr_javadoccomment">     * List fields = config.configurationsAt("tables.table(0).fields.field");</em>
<a class="jxr_linenumber" name="620" href="#620">620</a> <em class="jxr_javadoccomment">     * for(Iterator it = fields.iterator(); it.hasNext();)</em>
<a class="jxr_linenumber" name="621" href="#621">621</a> <em class="jxr_javadoccomment">     * {</em>
<a class="jxr_linenumber" name="622" href="#622">622</a> <em class="jxr_javadoccomment">     *     HierarchicalConfiguration sub = (HierarchicalConfiguration) it.next();</em>
<a class="jxr_linenumber" name="623" href="#623">623</a> <em class="jxr_javadoccomment">     *     // now the children and attributes of the field node can be</em>
<a class="jxr_linenumber" name="624" href="#624">624</a> <em class="jxr_javadoccomment">     *     // directly accessed</em>
<a class="jxr_linenumber" name="625" href="#625">625</a> <em class="jxr_javadoccomment">     *     String fieldName = sub.getString("name");</em>
<a class="jxr_linenumber" name="626" href="#626">626</a> <em class="jxr_javadoccomment">     *     String fieldType = sub.getString("type");</em>
<a class="jxr_linenumber" name="627" href="#627">627</a> <em class="jxr_javadoccomment">     *     ...</em>
<a class="jxr_linenumber" name="628" href="#628">628</a> <em class="jxr_javadoccomment">     * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="629" href="#629">629</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="630" href="#630">630</a> <em class="jxr_javadoccomment">     * @param key the key for selecting the desired nodes</em>
<a class="jxr_linenumber" name="631" href="#631">631</a> <em class="jxr_javadoccomment">     * @return a list with hierarchical configuration objects; each</em>
<a class="jxr_linenumber" name="632" href="#632">632</a> <em class="jxr_javadoccomment">     * configuration represents one of the nodes selected by the passed in key</em>
<a class="jxr_linenumber" name="633" href="#633">633</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="634" href="#634">634</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="635" href="#635">635</a>     <strong class="jxr_keyword">public</strong> List&lt;HierarchicalConfiguration&gt; configurationsAt(String key)
<a class="jxr_linenumber" name="636" href="#636">636</a>     {
<a class="jxr_linenumber" name="637" href="#637">637</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="638" href="#638">638</a>         List&lt;HierarchicalConfiguration&gt; configs = <strong class="jxr_keyword">new</strong> ArrayList&lt;HierarchicalConfiguration&gt;(nodes.size());
<a class="jxr_linenumber" name="639" href="#639">639</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode node : nodes)
<a class="jxr_linenumber" name="640" href="#640">640</a>         {
<a class="jxr_linenumber" name="641" href="#641">641</a>             configs.add(createSubnodeConfiguration(node));
<a class="jxr_linenumber" name="642" href="#642">642</a>         }
<a class="jxr_linenumber" name="643" href="#643">643</a>         <strong class="jxr_keyword">return</strong> configs;
<a class="jxr_linenumber" name="644" href="#644">644</a>     }
<a class="jxr_linenumber" name="645" href="#645">645</a> 
<a class="jxr_linenumber" name="646" href="#646">646</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="647" href="#647">647</a> <em class="jxr_javadoccomment">     * Creates a subnode configuration for the specified node. This method is</em>
<a class="jxr_linenumber" name="648" href="#648">648</a> <em class="jxr_javadoccomment">     * called by {@code configurationAt()} and</em>
<a class="jxr_linenumber" name="649" href="#649">649</a> <em class="jxr_javadoccomment">     * {@code configurationsAt()}.</em>
<a class="jxr_linenumber" name="650" href="#650">650</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="651" href="#651">651</a> <em class="jxr_javadoccomment">     * @param node the node, for which a subnode configuration is to be created</em>
<a class="jxr_linenumber" name="652" href="#652">652</a> <em class="jxr_javadoccomment">     * @return the configuration for the given node</em>
<a class="jxr_linenumber" name="653" href="#653">653</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="654" href="#654">654</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="655" href="#655">655</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> createSubnodeConfiguration(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="656" href="#656">656</a>     {
<a class="jxr_linenumber" name="657" href="#657">657</a>         <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> result = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a>(<strong class="jxr_keyword">this</strong>, node);
<a class="jxr_linenumber" name="658" href="#658">658</a>         registerSubnodeConfiguration(result);
<a class="jxr_linenumber" name="659" href="#659">659</a>         <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="660" href="#660">660</a>     }
<a class="jxr_linenumber" name="661" href="#661">661</a> 
<a class="jxr_linenumber" name="662" href="#662">662</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="663" href="#663">663</a> <em class="jxr_javadoccomment">     * Creates a new subnode configuration for the specified node and sets its</em>
<a class="jxr_linenumber" name="664" href="#664">664</a> <em class="jxr_javadoccomment">     * construction key. A subnode configuration created this way will be aware</em>
<a class="jxr_linenumber" name="665" href="#665">665</a> <em class="jxr_javadoccomment">     * of structural changes of its parent.</em>
<a class="jxr_linenumber" name="666" href="#666">666</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="667" href="#667">667</a> <em class="jxr_javadoccomment">     * @param node the node, for which a subnode configuration is to be created</em>
<a class="jxr_linenumber" name="668" href="#668">668</a> <em class="jxr_javadoccomment">     * @param subnodeKey the key used to construct the configuration</em>
<a class="jxr_linenumber" name="669" href="#669">669</a> <em class="jxr_javadoccomment">     * @return the configuration for the given node</em>
<a class="jxr_linenumber" name="670" href="#670">670</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="671" href="#671">671</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="672" href="#672">672</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> createSubnodeConfiguration(
<a class="jxr_linenumber" name="673" href="#673">673</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node, String subnodeKey)
<a class="jxr_linenumber" name="674" href="#674">674</a>     {
<a class="jxr_linenumber" name="675" href="#675">675</a>         <a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> result = createSubnodeConfiguration(node);
<a class="jxr_linenumber" name="676" href="#676">676</a>         result.setSubnodeKey(subnodeKey);
<a class="jxr_linenumber" name="677" href="#677">677</a>         <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="678" href="#678">678</a>     }
<a class="jxr_linenumber" name="679" href="#679">679</a> 
<a class="jxr_linenumber" name="680" href="#680">680</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="681" href="#681">681</a> <em class="jxr_javadoccomment">     * This method is always called when a subnode configuration created from</em>
<a class="jxr_linenumber" name="682" href="#682">682</a> <em class="jxr_javadoccomment">     * this configuration has been modified. This implementation transforms the</em>
<a class="jxr_linenumber" name="683" href="#683">683</a> <em class="jxr_javadoccomment">     * received event into an event of type {@code EVENT_SUBNODE_CHANGED}</em>
<a class="jxr_linenumber" name="684" href="#684">684</a> <em class="jxr_javadoccomment">     * and notifies the registered listeners.</em>
<a class="jxr_linenumber" name="685" href="#685">685</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="686" href="#686">686</a> <em class="jxr_javadoccomment">     * @param event the event describing the change</em>
<a class="jxr_linenumber" name="687" href="#687">687</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="688" href="#688">688</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="689" href="#689">689</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> subnodeConfigurationChanged(<a href="../../../../org/apache/commons/configuration/event/ConfigurationEvent.html">ConfigurationEvent</a> event)
<a class="jxr_linenumber" name="690" href="#690">690</a>     {
<a class="jxr_linenumber" name="691" href="#691">691</a>         fireEvent(EVENT_SUBNODE_CHANGED, <strong class="jxr_keyword">null</strong>, event, event.isBeforeUpdate());
<a class="jxr_linenumber" name="692" href="#692">692</a>     }
<a class="jxr_linenumber" name="693" href="#693">693</a> 
<a class="jxr_linenumber" name="694" href="#694">694</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="695" href="#695">695</a> <em class="jxr_javadoccomment">     * Registers this instance at the given subnode configuration. This</em>
<a class="jxr_linenumber" name="696" href="#696">696</a> <em class="jxr_javadoccomment">     * implementation will register a change listener, so that modifications of</em>
<a class="jxr_linenumber" name="697" href="#697">697</a> <em class="jxr_javadoccomment">     * the subnode configuration can be tracked.</em>
<a class="jxr_linenumber" name="698" href="#698">698</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="699" href="#699">699</a> <em class="jxr_javadoccomment">     * @param config the subnode configuration</em>
<a class="jxr_linenumber" name="700" href="#700">700</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="701" href="#701">701</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="702" href="#702">702</a>     <strong class="jxr_keyword">void</strong> registerSubnodeConfiguration(<a href="../../../../org/apache/commons/configuration/SubnodeConfiguration.html">SubnodeConfiguration</a> config)
<a class="jxr_linenumber" name="703" href="#703">703</a>     {
<a class="jxr_linenumber" name="704" href="#704">704</a>         config.addConfigurationListener(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/event/ConfigurationListener.html">ConfigurationListener</a>()
<a class="jxr_linenumber" name="705" href="#705">705</a>         {
<a class="jxr_linenumber" name="706" href="#706">706</a>             <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> configurationChanged(<a href="../../../../org/apache/commons/configuration/event/ConfigurationEvent.html">ConfigurationEvent</a> event)
<a class="jxr_linenumber" name="707" href="#707">707</a>             {
<a class="jxr_linenumber" name="708" href="#708">708</a>                 subnodeConfigurationChanged(event);
<a class="jxr_linenumber" name="709" href="#709">709</a>             }
<a class="jxr_linenumber" name="710" href="#710">710</a>         });
<a class="jxr_linenumber" name="711" href="#711">711</a>     }
<a class="jxr_linenumber" name="712" href="#712">712</a> 
<a class="jxr_linenumber" name="713" href="#713">713</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="714" href="#714">714</a> <em class="jxr_javadoccomment">     * Checks if the specified key is contained in this configuration. Note that</em>
<a class="jxr_linenumber" name="715" href="#715">715</a> <em class="jxr_javadoccomment">     * for this configuration the term &amp;quot;contained&amp;quot; means that the key</em>
<a class="jxr_linenumber" name="716" href="#716">716</a> <em class="jxr_javadoccomment">     * has an associated value. If there is a node for this key that has no</em>
<a class="jxr_linenumber" name="717" href="#717">717</a> <em class="jxr_javadoccomment">     * value but children (either defined or undefined), this method will still</em>
<a class="jxr_linenumber" name="718" href="#718">718</a> <em class="jxr_javadoccomment">     * return &lt;b&gt;false &lt;/b&gt;.</em>
<a class="jxr_linenumber" name="719" href="#719">719</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="720" href="#720">720</a> <em class="jxr_javadoccomment">     * @param key the key to be chekced</em>
<a class="jxr_linenumber" name="721" href="#721">721</a> <em class="jxr_javadoccomment">     * @return a flag if this key is contained in this configuration</em>
<a class="jxr_linenumber" name="722" href="#722">722</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="723" href="#723">723</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> containsKey(String key)
<a class="jxr_linenumber" name="724" href="#724">724</a>     {
<a class="jxr_linenumber" name="725" href="#725">725</a>         <strong class="jxr_keyword">return</strong> getProperty(key) != <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="726" href="#726">726</a>     }
<a class="jxr_linenumber" name="727" href="#727">727</a> 
<a class="jxr_linenumber" name="728" href="#728">728</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="729" href="#729">729</a> <em class="jxr_javadoccomment">     * Sets the value of the specified property.</em>
<a class="jxr_linenumber" name="730" href="#730">730</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="731" href="#731">731</a> <em class="jxr_javadoccomment">     * @param key the key of the property to set</em>
<a class="jxr_linenumber" name="732" href="#732">732</a> <em class="jxr_javadoccomment">     * @param value the new value of this property</em>
<a class="jxr_linenumber" name="733" href="#733">733</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="734" href="#734">734</a>     @Override
<a class="jxr_linenumber" name="735" href="#735">735</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setProperty(String key, Object value)
<a class="jxr_linenumber" name="736" href="#736">736</a>     {
<a class="jxr_linenumber" name="737" href="#737">737</a>         fireEvent(EVENT_SET_PROPERTY, key, value, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="738" href="#738">738</a> 
<a class="jxr_linenumber" name="739" href="#739">739</a>         <em class="jxr_comment">// Update the existing nodes for this property</em>
<a class="jxr_linenumber" name="740" href="#740">740</a>         Iterator&lt;ConfigurationNode&gt; itNodes = fetchNodeList(key).iterator();
<a class="jxr_linenumber" name="741" href="#741">741</a>         Iterator&lt;?&gt; itValues;
<a class="jxr_linenumber" name="742" href="#742">742</a>         <strong class="jxr_keyword">if</strong> (!isDelimiterParsingDisabled() || !(value instanceof String))
<a class="jxr_linenumber" name="743" href="#743">743</a>         {
<a class="jxr_linenumber" name="744" href="#744">744</a>             itValues = PropertyConverter.toIterator(value, getListDelimiter());
<a class="jxr_linenumber" name="745" href="#745">745</a>         }
<a class="jxr_linenumber" name="746" href="#746">746</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="747" href="#747">747</a>         {
<a class="jxr_linenumber" name="748" href="#748">748</a>             itValues = Collections.singleton(value).iterator();
<a class="jxr_linenumber" name="749" href="#749">749</a>         }
<a class="jxr_linenumber" name="750" href="#750">750</a> 
<a class="jxr_linenumber" name="751" href="#751">751</a>         <strong class="jxr_keyword">while</strong> (itNodes.hasNext() &amp;&amp; itValues.hasNext())
<a class="jxr_linenumber" name="752" href="#752">752</a>         {
<a class="jxr_linenumber" name="753" href="#753">753</a>             itNodes.next().setValue(itValues.next());
<a class="jxr_linenumber" name="754" href="#754">754</a>         }
<a class="jxr_linenumber" name="755" href="#755">755</a> 
<a class="jxr_linenumber" name="756" href="#756">756</a>         <em class="jxr_comment">// Add additional nodes if necessary</em>
<a class="jxr_linenumber" name="757" href="#757">757</a>         <strong class="jxr_keyword">while</strong> (itValues.hasNext())
<a class="jxr_linenumber" name="758" href="#758">758</a>         {
<a class="jxr_linenumber" name="759" href="#759">759</a>             addPropertyDirect(key, itValues.next());
<a class="jxr_linenumber" name="760" href="#760">760</a>         }
<a class="jxr_linenumber" name="761" href="#761">761</a> 
<a class="jxr_linenumber" name="762" href="#762">762</a>         <em class="jxr_comment">// Remove remaining nodes</em>
<a class="jxr_linenumber" name="763" href="#763">763</a>         <strong class="jxr_keyword">while</strong> (itNodes.hasNext())
<a class="jxr_linenumber" name="764" href="#764">764</a>         {
<a class="jxr_linenumber" name="765" href="#765">765</a>             clearNode(itNodes.next());
<a class="jxr_linenumber" name="766" href="#766">766</a>         }
<a class="jxr_linenumber" name="767" href="#767">767</a> 
<a class="jxr_linenumber" name="768" href="#768">768</a>         fireEvent(EVENT_SET_PROPERTY, key, value, false);
<a class="jxr_linenumber" name="769" href="#769">769</a>     }
<a class="jxr_linenumber" name="770" href="#770">770</a> 
<a class="jxr_linenumber" name="771" href="#771">771</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="772" href="#772">772</a> <em class="jxr_javadoccomment">     * Clears this configuration. This is a more efficient implementation than</em>
<a class="jxr_linenumber" name="773" href="#773">773</a> <em class="jxr_javadoccomment">     * the one inherited from the base class. It directly removes all data from</em>
<a class="jxr_linenumber" name="774" href="#774">774</a> <em class="jxr_javadoccomment">     * the root node.</em>
<a class="jxr_linenumber" name="775" href="#775">775</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="776" href="#776">776</a>     @Override
<a class="jxr_linenumber" name="777" href="#777">777</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clear()
<a class="jxr_linenumber" name="778" href="#778">778</a>     {
<a class="jxr_linenumber" name="779" href="#779">779</a>         fireEvent(EVENT_CLEAR, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="780" href="#780">780</a>         getRootNode().removeAttributes();
<a class="jxr_linenumber" name="781" href="#781">781</a>         getRootNode().removeChildren();
<a class="jxr_linenumber" name="782" href="#782">782</a>         getRootNode().setValue(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="783" href="#783">783</a>         fireEvent(EVENT_CLEAR, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, false);
<a class="jxr_linenumber" name="784" href="#784">784</a>     }
<a class="jxr_linenumber" name="785" href="#785">785</a> 
<a class="jxr_linenumber" name="786" href="#786">786</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="787" href="#787">787</a> <em class="jxr_javadoccomment">     * Removes all values of the property with the given name and of keys that</em>
<a class="jxr_linenumber" name="788" href="#788">788</a> <em class="jxr_javadoccomment">     * start with this name. So if there is a property with the key</em>
<a class="jxr_linenumber" name="789" href="#789">789</a> <em class="jxr_javadoccomment">     * &amp;quot;foo&amp;quot; and a property with the key &amp;quot;foo.bar&amp;quot;, a call</em>
<a class="jxr_linenumber" name="790" href="#790">790</a> <em class="jxr_javadoccomment">     * of {@code clearTree("foo")} would remove both properties.</em>
<a class="jxr_linenumber" name="791" href="#791">791</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="792" href="#792">792</a> <em class="jxr_javadoccomment">     * @param key the key of the property to be removed</em>
<a class="jxr_linenumber" name="793" href="#793">793</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="794" href="#794">794</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clearTree(String key)
<a class="jxr_linenumber" name="795" href="#795">795</a>     {
<a class="jxr_linenumber" name="796" href="#796">796</a>         fireEvent(EVENT_CLEAR_TREE, key, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="797" href="#797">797</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="798" href="#798">798</a> 
<a class="jxr_linenumber" name="799" href="#799">799</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode node : nodes)
<a class="jxr_linenumber" name="800" href="#800">800</a>         {
<a class="jxr_linenumber" name="801" href="#801">801</a>             removeNode(node);
<a class="jxr_linenumber" name="802" href="#802">802</a>         }
<a class="jxr_linenumber" name="803" href="#803">803</a>         fireEvent(EVENT_CLEAR_TREE, key, nodes, false);
<a class="jxr_linenumber" name="804" href="#804">804</a>     }
<a class="jxr_linenumber" name="805" href="#805">805</a> 
<a class="jxr_linenumber" name="806" href="#806">806</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="807" href="#807">807</a> <em class="jxr_javadoccomment">     * Removes the property with the given key. Properties with names that start</em>
<a class="jxr_linenumber" name="808" href="#808">808</a> <em class="jxr_javadoccomment">     * with the given key (i.e. properties below the specified key in the</em>
<a class="jxr_linenumber" name="809" href="#809">809</a> <em class="jxr_javadoccomment">     * hierarchy) won't be affected.</em>
<a class="jxr_linenumber" name="810" href="#810">810</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="811" href="#811">811</a> <em class="jxr_javadoccomment">     * @param key the key of the property to be removed</em>
<a class="jxr_linenumber" name="812" href="#812">812</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="813" href="#813">813</a>     @Override
<a class="jxr_linenumber" name="814" href="#814">814</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clearProperty(String key)
<a class="jxr_linenumber" name="815" href="#815">815</a>     {
<a class="jxr_linenumber" name="816" href="#816">816</a>         fireEvent(EVENT_CLEAR_PROPERTY, key, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="817" href="#817">817</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="818" href="#818">818</a> 
<a class="jxr_linenumber" name="819" href="#819">819</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode node : nodes)
<a class="jxr_linenumber" name="820" href="#820">820</a>         {
<a class="jxr_linenumber" name="821" href="#821">821</a>             clearNode(node);
<a class="jxr_linenumber" name="822" href="#822">822</a>         }
<a class="jxr_linenumber" name="823" href="#823">823</a> 
<a class="jxr_linenumber" name="824" href="#824">824</a>         fireEvent(EVENT_CLEAR_PROPERTY, key, <strong class="jxr_keyword">null</strong>, false);
<a class="jxr_linenumber" name="825" href="#825">825</a>     }
<a class="jxr_linenumber" name="826" href="#826">826</a> 
<a class="jxr_linenumber" name="827" href="#827">827</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="828" href="#828">828</a> <em class="jxr_javadoccomment">     * Returns an iterator with all keys defined in this configuration.</em>
<a class="jxr_linenumber" name="829" href="#829">829</a> <em class="jxr_javadoccomment">     * Note that the keys returned by this method will not contain any</em>
<a class="jxr_linenumber" name="830" href="#830">830</a> <em class="jxr_javadoccomment">     * indices. This means that some structure will be lost.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="831" href="#831">831</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="832" href="#832">832</a> <em class="jxr_javadoccomment">     * @return an iterator with the defined keys in this configuration</em>
<a class="jxr_linenumber" name="833" href="#833">833</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="834" href="#834">834</a>     <strong class="jxr_keyword">public</strong> Iterator&lt;String&gt; getKeys()
<a class="jxr_linenumber" name="835" href="#835">835</a>     {
<a class="jxr_linenumber" name="836" href="#836">836</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a> visitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a>();
<a class="jxr_linenumber" name="837" href="#837">837</a>         getRootNode().visit(visitor);
<a class="jxr_linenumber" name="838" href="#838">838</a> 
<a class="jxr_linenumber" name="839" href="#839">839</a>         <strong class="jxr_keyword">return</strong> visitor.getKeyList().iterator();
<a class="jxr_linenumber" name="840" href="#840">840</a>     }
<a class="jxr_linenumber" name="841" href="#841">841</a> 
<a class="jxr_linenumber" name="842" href="#842">842</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="843" href="#843">843</a> <em class="jxr_javadoccomment">     * Returns an iterator with all keys defined in this configuration that</em>
<a class="jxr_linenumber" name="844" href="#844">844</a> <em class="jxr_javadoccomment">     * start with the given prefix. The returned keys will not contain any</em>
<a class="jxr_linenumber" name="845" href="#845">845</a> <em class="jxr_javadoccomment">     * indices. This implementation tries to locate a node whose key is the same</em>
<a class="jxr_linenumber" name="846" href="#846">846</a> <em class="jxr_javadoccomment">     * as the passed in prefix. Then the subtree of this node is traversed, and</em>
<a class="jxr_linenumber" name="847" href="#847">847</a> <em class="jxr_javadoccomment">     * the keys of all nodes encountered (including attributes) are added to the</em>
<a class="jxr_linenumber" name="848" href="#848">848</a> <em class="jxr_javadoccomment">     * result set.</em>
<a class="jxr_linenumber" name="849" href="#849">849</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="850" href="#850">850</a> <em class="jxr_javadoccomment">     * @param prefix the prefix of the keys to start with</em>
<a class="jxr_linenumber" name="851" href="#851">851</a> <em class="jxr_javadoccomment">     * @return an iterator with the found keys</em>
<a class="jxr_linenumber" name="852" href="#852">852</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="853" href="#853">853</a>     @Override
<a class="jxr_linenumber" name="854" href="#854">854</a>     <strong class="jxr_keyword">public</strong> Iterator&lt;String&gt; getKeys(String prefix)
<a class="jxr_linenumber" name="855" href="#855">855</a>     {
<a class="jxr_linenumber" name="856" href="#856">856</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a> visitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a>(prefix);
<a class="jxr_linenumber" name="857" href="#857">857</a>         <strong class="jxr_keyword">if</strong> (containsKey(prefix))
<a class="jxr_linenumber" name="858" href="#858">858</a>         {
<a class="jxr_linenumber" name="859" href="#859">859</a>             <em class="jxr_comment">// explicitly add the prefix</em>
<a class="jxr_linenumber" name="860" href="#860">860</a>             visitor.getKeyList().add(prefix);
<a class="jxr_linenumber" name="861" href="#861">861</a>         }
<a class="jxr_linenumber" name="862" href="#862">862</a> 
<a class="jxr_linenumber" name="863" href="#863">863</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(prefix);
<a class="jxr_linenumber" name="864" href="#864">864</a> 
<a class="jxr_linenumber" name="865" href="#865">865</a>         <strong class="jxr_keyword">for</strong> (ConfigurationNode node : nodes)
<a class="jxr_linenumber" name="866" href="#866">866</a>         {
<a class="jxr_linenumber" name="867" href="#867">867</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode c : node.getChildren())
<a class="jxr_linenumber" name="868" href="#868">868</a>             {
<a class="jxr_linenumber" name="869" href="#869">869</a>                 c.visit(visitor);
<a class="jxr_linenumber" name="870" href="#870">870</a>             }
<a class="jxr_linenumber" name="871" href="#871">871</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode attr : node.getAttributes())
<a class="jxr_linenumber" name="872" href="#872">872</a>             {
<a class="jxr_linenumber" name="873" href="#873">873</a>                 attr.visit(visitor);
<a class="jxr_linenumber" name="874" href="#874">874</a>             }
<a class="jxr_linenumber" name="875" href="#875">875</a>         }
<a class="jxr_linenumber" name="876" href="#876">876</a> 
<a class="jxr_linenumber" name="877" href="#877">877</a>         <strong class="jxr_keyword">return</strong> visitor.getKeyList().iterator();
<a class="jxr_linenumber" name="878" href="#878">878</a>     }
<a class="jxr_linenumber" name="879" href="#879">879</a> 
<a class="jxr_linenumber" name="880" href="#880">880</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="881" href="#881">881</a> <em class="jxr_javadoccomment">     * Returns the maximum defined index for the given key. This is useful if</em>
<a class="jxr_linenumber" name="882" href="#882">882</a> <em class="jxr_javadoccomment">     * there are multiple values for this key. They can then be addressed</em>
<a class="jxr_linenumber" name="883" href="#883">883</a> <em class="jxr_javadoccomment">     * separately by specifying indices from 0 to the return value of this</em>
<a class="jxr_linenumber" name="884" href="#884">884</a> <em class="jxr_javadoccomment">     * method.</em>
<a class="jxr_linenumber" name="885" href="#885">885</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="886" href="#886">886</a> <em class="jxr_javadoccomment">     * @param key the key to be checked</em>
<a class="jxr_linenumber" name="887" href="#887">887</a> <em class="jxr_javadoccomment">     * @return the maximum defined index for this key</em>
<a class="jxr_linenumber" name="888" href="#888">888</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="889" href="#889">889</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getMaxIndex(String key)
<a class="jxr_linenumber" name="890" href="#890">890</a>     {
<a class="jxr_linenumber" name="891" href="#891">891</a>         <strong class="jxr_keyword">return</strong> fetchNodeList(key).size() - 1;
<a class="jxr_linenumber" name="892" href="#892">892</a>     }
<a class="jxr_linenumber" name="893" href="#893">893</a> 
<a class="jxr_linenumber" name="894" href="#894">894</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="895" href="#895">895</a> <em class="jxr_javadoccomment">     * Creates a copy of this object. This new configuration object will contain</em>
<a class="jxr_linenumber" name="896" href="#896">896</a> <em class="jxr_javadoccomment">     * copies of all nodes in the same structure. Registered event listeners</em>
<a class="jxr_linenumber" name="897" href="#897">897</a> <em class="jxr_javadoccomment">     * won't be cloned; so they are not registered at the returned copy.</em>
<a class="jxr_linenumber" name="898" href="#898">898</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="899" href="#899">899</a> <em class="jxr_javadoccomment">     * @return the copy</em>
<a class="jxr_linenumber" name="900" href="#900">900</a> <em class="jxr_javadoccomment">     * @since 1.2</em>
<a class="jxr_linenumber" name="901" href="#901">901</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="902" href="#902">902</a>     @Override
<a class="jxr_linenumber" name="903" href="#903">903</a>     <strong class="jxr_keyword">public</strong> Object clone()
<a class="jxr_linenumber" name="904" href="#904">904</a>     {
<a class="jxr_linenumber" name="905" href="#905">905</a>         <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="906" href="#906">906</a>         {
<a class="jxr_linenumber" name="907" href="#907">907</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> copy = (HierarchicalConfiguration) <strong class="jxr_keyword">super</strong>
<a class="jxr_linenumber" name="908" href="#908">908</a>                     .clone();
<a class="jxr_linenumber" name="909" href="#909">909</a> 
<a class="jxr_linenumber" name="910" href="#910">910</a>             <em class="jxr_comment">// clone the nodes, too</em>
<a class="jxr_linenumber" name="911" href="#911">911</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a> v = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a>();
<a class="jxr_linenumber" name="912" href="#912">912</a>             getRootNode().visit(v);
<a class="jxr_linenumber" name="913" href="#913">913</a>             copy.setRootNode(v.getClone());
<a class="jxr_linenumber" name="914" href="#914">914</a> 
<a class="jxr_linenumber" name="915" href="#915">915</a>             <strong class="jxr_keyword">return</strong> copy;
<a class="jxr_linenumber" name="916" href="#916">916</a>         }
<a class="jxr_linenumber" name="917" href="#917">917</a>         <strong class="jxr_keyword">catch</strong> (CloneNotSupportedException cex)
<a class="jxr_linenumber" name="918" href="#918">918</a>         {
<a class="jxr_linenumber" name="919" href="#919">919</a>             <em class="jxr_comment">// should not happen</em>
<a class="jxr_linenumber" name="920" href="#920">920</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/ConfigurationRuntimeException.html">ConfigurationRuntimeException</a>(cex);
<a class="jxr_linenumber" name="921" href="#921">921</a>         }
<a class="jxr_linenumber" name="922" href="#922">922</a>     }
<a class="jxr_linenumber" name="923" href="#923">923</a> 
<a class="jxr_linenumber" name="924" href="#924">924</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="925" href="#925">925</a> <em class="jxr_javadoccomment">     * Returns a configuration with the same content as this configuration, but</em>
<a class="jxr_linenumber" name="926" href="#926">926</a> <em class="jxr_javadoccomment">     * with all variables replaced by their actual values. This implementation</em>
<a class="jxr_linenumber" name="927" href="#927">927</a> <em class="jxr_javadoccomment">     * is specific for hierarchical configurations. It clones the current</em>
<a class="jxr_linenumber" name="928" href="#928">928</a> <em class="jxr_javadoccomment">     * configuration and runs a specialized visitor on the clone, which performs</em>
<a class="jxr_linenumber" name="929" href="#929">929</a> <em class="jxr_javadoccomment">     * interpolation on the single configuration nodes.</em>
<a class="jxr_linenumber" name="930" href="#930">930</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="931" href="#931">931</a> <em class="jxr_javadoccomment">     * @return a configuration with all variables interpolated</em>
<a class="jxr_linenumber" name="932" href="#932">932</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="933" href="#933">933</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="934" href="#934">934</a>     @Override
<a class="jxr_linenumber" name="935" href="#935">935</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> interpolatedConfiguration()
<a class="jxr_linenumber" name="936" href="#936">936</a>     {
<a class="jxr_linenumber" name="937" href="#937">937</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">HierarchicalConfiguration</a> c = (HierarchicalConfiguration) clone();
<a class="jxr_linenumber" name="938" href="#938">938</a>         c.getRootNode().visit(<strong class="jxr_keyword">new</strong> ConfigurationNodeVisitorAdapter()
<a class="jxr_linenumber" name="939" href="#939">939</a>         {
<a class="jxr_linenumber" name="940" href="#940">940</a>             @Override
<a class="jxr_linenumber" name="941" href="#941">941</a>             <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitAfterChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="942" href="#942">942</a>             {
<a class="jxr_linenumber" name="943" href="#943">943</a>                 node.setValue(interpolate(node.getValue()));
<a class="jxr_linenumber" name="944" href="#944">944</a>             }
<a class="jxr_linenumber" name="945" href="#945">945</a>         });
<a class="jxr_linenumber" name="946" href="#946">946</a>         <strong class="jxr_keyword">return</strong> c;
<a class="jxr_linenumber" name="947" href="#947">947</a>     }
<a class="jxr_linenumber" name="948" href="#948">948</a> 
<a class="jxr_linenumber" name="949" href="#949">949</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="950" href="#950">950</a> <em class="jxr_javadoccomment">     * Helper method for fetching a list of all nodes that are addressed by the</em>
<a class="jxr_linenumber" name="951" href="#951">951</a> <em class="jxr_javadoccomment">     * specified key.</em>
<a class="jxr_linenumber" name="952" href="#952">952</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="953" href="#953">953</a> <em class="jxr_javadoccomment">     * @param key the key</em>
<a class="jxr_linenumber" name="954" href="#954">954</a> <em class="jxr_javadoccomment">     * @return a list with all affected nodes (never &lt;b&gt;null &lt;/b&gt;)</em>
<a class="jxr_linenumber" name="955" href="#955">955</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="956" href="#956">956</a>     <strong class="jxr_keyword">protected</strong> List&lt;ConfigurationNode&gt; fetchNodeList(String key)
<a class="jxr_linenumber" name="957" href="#957">957</a>     {
<a class="jxr_linenumber" name="958" href="#958">958</a>         <strong class="jxr_keyword">return</strong> getExpressionEngine().query(getRootNode(), key);
<a class="jxr_linenumber" name="959" href="#959">959</a>     }
<a class="jxr_linenumber" name="960" href="#960">960</a> 
<a class="jxr_linenumber" name="961" href="#961">961</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="962" href="#962">962</a> <em class="jxr_javadoccomment">     * Recursive helper method for fetching a property. This method processes</em>
<a class="jxr_linenumber" name="963" href="#963">963</a> <em class="jxr_javadoccomment">     * all facets of a configuration key, traverses the tree of properties and</em>
<a class="jxr_linenumber" name="964" href="#964">964</a> <em class="jxr_javadoccomment">     * fetches the the nodes of all matching properties.</em>
<a class="jxr_linenumber" name="965" href="#965">965</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="966" href="#966">966</a> <em class="jxr_javadoccomment">     * @param keyPart the configuration key iterator</em>
<a class="jxr_linenumber" name="967" href="#967">967</a> <em class="jxr_javadoccomment">     * @param node the actual node</em>
<a class="jxr_linenumber" name="968" href="#968">968</a> <em class="jxr_javadoccomment">     * @param nodes here the found nodes are stored</em>
<a class="jxr_linenumber" name="969" href="#969">969</a> <em class="jxr_javadoccomment">     * @deprecated Property keys are now evaluated by the expression engine</em>
<a class="jxr_linenumber" name="970" href="#970">970</a> <em class="jxr_javadoccomment">     * associated with the configuration; this method will no longer be called.</em>
<a class="jxr_linenumber" name="971" href="#971">971</a> <em class="jxr_javadoccomment">     * If you want to modify the way properties are looked up, consider</em>
<a class="jxr_linenumber" name="972" href="#972">972</a> <em class="jxr_javadoccomment">     * implementing you own {@code ExpressionEngine} implementation.</em>
<a class="jxr_linenumber" name="973" href="#973">973</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="974" href="#974">974</a>     @Deprecated
<a class="jxr_linenumber" name="975" href="#975">975</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> findPropertyNodes(ConfigurationKey.KeyIterator keyPart,
<a class="jxr_linenumber" name="976" href="#976">976</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node, Collection&lt;ConfigurationNode&gt; nodes)
<a class="jxr_linenumber" name="977" href="#977">977</a>     {
<a class="jxr_linenumber" name="978" href="#978">978</a>     }
<a class="jxr_linenumber" name="979" href="#979">979</a> 
<a class="jxr_linenumber" name="980" href="#980">980</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="981" href="#981">981</a> <em class="jxr_javadoccomment">     * Checks if the specified node is defined.</em>
<a class="jxr_linenumber" name="982" href="#982">982</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="983" href="#983">983</a> <em class="jxr_javadoccomment">     * @param node the node to be checked</em>
<a class="jxr_linenumber" name="984" href="#984">984</a> <em class="jxr_javadoccomment">     * @return a flag if this node is defined</em>
<a class="jxr_linenumber" name="985" href="#985">985</a> <em class="jxr_javadoccomment">     * @deprecated Use the method {@link #nodeDefined(ConfigurationNode)}</em>
<a class="jxr_linenumber" name="986" href="#986">986</a> <em class="jxr_javadoccomment">     * instead.</em>
<a class="jxr_linenumber" name="987" href="#987">987</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="988" href="#988">988</a>     @Deprecated
<a class="jxr_linenumber" name="989" href="#989">989</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> nodeDefined(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="990" href="#990">990</a>     {
<a class="jxr_linenumber" name="991" href="#991">991</a>         <strong class="jxr_keyword">return</strong> nodeDefined((ConfigurationNode) node);
<a class="jxr_linenumber" name="992" href="#992">992</a>     }
<a class="jxr_linenumber" name="993" href="#993">993</a> 
<a class="jxr_linenumber" name="994" href="#994">994</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="995" href="#995">995</a> <em class="jxr_javadoccomment">     * Checks if the specified node is defined.</em>
<a class="jxr_linenumber" name="996" href="#996">996</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="997" href="#997">997</a> <em class="jxr_javadoccomment">     * @param node the node to be checked</em>
<a class="jxr_linenumber" name="998" href="#998">998</a> <em class="jxr_javadoccomment">     * @return a flag if this node is defined</em>
<a class="jxr_linenumber" name="999" href="#999">999</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1000" href="#1000">1000</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">boolean</strong> nodeDefined(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1001" href="#1001">1001</a>     {
<a class="jxr_linenumber" name="1002" href="#1002">1002</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedVisitor</a> visitor = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedVisitor</a>();
<a class="jxr_linenumber" name="1003" href="#1003">1003</a>         node.visit(visitor);
<a class="jxr_linenumber" name="1004" href="#1004">1004</a>         <strong class="jxr_keyword">return</strong> visitor.isDefined();
<a class="jxr_linenumber" name="1005" href="#1005">1005</a>     }
<a class="jxr_linenumber" name="1006" href="#1006">1006</a> 
<a class="jxr_linenumber" name="1007" href="#1007">1007</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1008" href="#1008">1008</a> <em class="jxr_javadoccomment">     * Removes the specified node from this configuration. This method ensures</em>
<a class="jxr_linenumber" name="1009" href="#1009">1009</a> <em class="jxr_javadoccomment">     * that parent nodes that become undefined by this operation are also</em>
<a class="jxr_linenumber" name="1010" href="#1010">1010</a> <em class="jxr_javadoccomment">     * removed.</em>
<a class="jxr_linenumber" name="1011" href="#1011">1011</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1012" href="#1012">1012</a> <em class="jxr_javadoccomment">     * @param node the node to be removed</em>
<a class="jxr_linenumber" name="1013" href="#1013">1013</a> <em class="jxr_javadoccomment">     * @deprecated Use the method {@link #removeNode(ConfigurationNode)}</em>
<a class="jxr_linenumber" name="1014" href="#1014">1014</a> <em class="jxr_javadoccomment">     * instead.</em>
<a class="jxr_linenumber" name="1015" href="#1015">1015</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1016" href="#1016">1016</a>     @Deprecated
<a class="jxr_linenumber" name="1017" href="#1017">1017</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> removeNode(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="1018" href="#1018">1018</a>     {
<a class="jxr_linenumber" name="1019" href="#1019">1019</a>         removeNode((ConfigurationNode) node);
<a class="jxr_linenumber" name="1020" href="#1020">1020</a>     }
<a class="jxr_linenumber" name="1021" href="#1021">1021</a> 
<a class="jxr_linenumber" name="1022" href="#1022">1022</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1023" href="#1023">1023</a> <em class="jxr_javadoccomment">     * Removes the specified node from this configuration. This method ensures</em>
<a class="jxr_linenumber" name="1024" href="#1024">1024</a> <em class="jxr_javadoccomment">     * that parent nodes that become undefined by this operation are also</em>
<a class="jxr_linenumber" name="1025" href="#1025">1025</a> <em class="jxr_javadoccomment">     * removed.</em>
<a class="jxr_linenumber" name="1026" href="#1026">1026</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1027" href="#1027">1027</a> <em class="jxr_javadoccomment">     * @param node the node to be removed</em>
<a class="jxr_linenumber" name="1028" href="#1028">1028</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1029" href="#1029">1029</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> removeNode(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1030" href="#1030">1030</a>     {
<a class="jxr_linenumber" name="1031" href="#1031">1031</a>         <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> parent = node.getParentNode();
<a class="jxr_linenumber" name="1032" href="#1032">1032</a>         <strong class="jxr_keyword">if</strong> (parent != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1033" href="#1033">1033</a>         {
<a class="jxr_linenumber" name="1034" href="#1034">1034</a>             parent.removeChild(node);
<a class="jxr_linenumber" name="1035" href="#1035">1035</a>             <strong class="jxr_keyword">if</strong> (!nodeDefined(parent))
<a class="jxr_linenumber" name="1036" href="#1036">1036</a>             {
<a class="jxr_linenumber" name="1037" href="#1037">1037</a>                 removeNode(parent);
<a class="jxr_linenumber" name="1038" href="#1038">1038</a>             }
<a class="jxr_linenumber" name="1039" href="#1039">1039</a>         }
<a class="jxr_linenumber" name="1040" href="#1040">1040</a>     }
<a class="jxr_linenumber" name="1041" href="#1041">1041</a> 
<a class="jxr_linenumber" name="1042" href="#1042">1042</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1043" href="#1043">1043</a> <em class="jxr_javadoccomment">     * Clears the value of the specified node. If the node becomes undefined by</em>
<a class="jxr_linenumber" name="1044" href="#1044">1044</a> <em class="jxr_javadoccomment">     * this operation, it is removed from the hierarchy.</em>
<a class="jxr_linenumber" name="1045" href="#1045">1045</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1046" href="#1046">1046</a> <em class="jxr_javadoccomment">     * @param node the node to be cleared</em>
<a class="jxr_linenumber" name="1047" href="#1047">1047</a> <em class="jxr_javadoccomment">     * @deprecated Use the method {@link #clearNode(ConfigurationNode)}</em>
<a class="jxr_linenumber" name="1048" href="#1048">1048</a> <em class="jxr_javadoccomment">     * instead</em>
<a class="jxr_linenumber" name="1049" href="#1049">1049</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1050" href="#1050">1050</a>     @Deprecated
<a class="jxr_linenumber" name="1051" href="#1051">1051</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> clearNode(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="1052" href="#1052">1052</a>     {
<a class="jxr_linenumber" name="1053" href="#1053">1053</a>         clearNode((ConfigurationNode) node);
<a class="jxr_linenumber" name="1054" href="#1054">1054</a>     }
<a class="jxr_linenumber" name="1055" href="#1055">1055</a> 
<a class="jxr_linenumber" name="1056" href="#1056">1056</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1057" href="#1057">1057</a> <em class="jxr_javadoccomment">     * Clears the value of the specified node. If the node becomes undefined by</em>
<a class="jxr_linenumber" name="1058" href="#1058">1058</a> <em class="jxr_javadoccomment">     * this operation, it is removed from the hierarchy.</em>
<a class="jxr_linenumber" name="1059" href="#1059">1059</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1060" href="#1060">1060</a> <em class="jxr_javadoccomment">     * @param node the node to be cleared</em>
<a class="jxr_linenumber" name="1061" href="#1061">1061</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1062" href="#1062">1062</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> clearNode(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1063" href="#1063">1063</a>     {
<a class="jxr_linenumber" name="1064" href="#1064">1064</a>         node.setValue(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="1065" href="#1065">1065</a>         <strong class="jxr_keyword">if</strong> (!nodeDefined(node))
<a class="jxr_linenumber" name="1066" href="#1066">1066</a>         {
<a class="jxr_linenumber" name="1067" href="#1067">1067</a>             removeNode(node);
<a class="jxr_linenumber" name="1068" href="#1068">1068</a>         }
<a class="jxr_linenumber" name="1069" href="#1069">1069</a>     }
<a class="jxr_linenumber" name="1070" href="#1070">1070</a> 
<a class="jxr_linenumber" name="1071" href="#1071">1071</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1072" href="#1072">1072</a> <em class="jxr_javadoccomment">     * Returns a reference to the parent node of an add operation. Nodes for new</em>
<a class="jxr_linenumber" name="1073" href="#1073">1073</a> <em class="jxr_javadoccomment">     * properties can be added as children of this node. If the path for the</em>
<a class="jxr_linenumber" name="1074" href="#1074">1074</a> <em class="jxr_javadoccomment">     * specified key does not exist so far, it is created now.</em>
<a class="jxr_linenumber" name="1075" href="#1075">1075</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1076" href="#1076">1076</a> <em class="jxr_javadoccomment">     * @param keyIt the iterator for the key of the new property</em>
<a class="jxr_linenumber" name="1077" href="#1077">1077</a> <em class="jxr_javadoccomment">     * @param startNode the node to start the search with</em>
<a class="jxr_linenumber" name="1078" href="#1078">1078</a> <em class="jxr_javadoccomment">     * @return the parent node for the add operation</em>
<a class="jxr_linenumber" name="1079" href="#1079">1079</a> <em class="jxr_javadoccomment">     * @deprecated Adding new properties is now to a major part delegated to the</em>
<a class="jxr_linenumber" name="1080" href="#1080">1080</a> <em class="jxr_javadoccomment">     * {@code ExpressionEngine} associated with this configuration instance.</em>
<a class="jxr_linenumber" name="1081" href="#1081">1081</a> <em class="jxr_javadoccomment">     * This method will no longer be called. Developers who want to modify the</em>
<a class="jxr_linenumber" name="1082" href="#1082">1082</a> <em class="jxr_javadoccomment">     * process of adding new properties should consider implementing their own</em>
<a class="jxr_linenumber" name="1083" href="#1083">1083</a> <em class="jxr_javadoccomment">     * expression engine.</em>
<a class="jxr_linenumber" name="1084" href="#1084">1084</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1085" href="#1085">1085</a>     @Deprecated
<a class="jxr_linenumber" name="1086" href="#1086">1086</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> fetchAddNode(ConfigurationKey.KeyIterator keyIt, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> startNode)
<a class="jxr_linenumber" name="1087" href="#1087">1087</a>     {
<a class="jxr_linenumber" name="1088" href="#1088">1088</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1089" href="#1089">1089</a>     }
<a class="jxr_linenumber" name="1090" href="#1090">1090</a> 
<a class="jxr_linenumber" name="1091" href="#1091">1091</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1092" href="#1092">1092</a> <em class="jxr_javadoccomment">     * Finds the last existing node for an add operation. This method traverses</em>
<a class="jxr_linenumber" name="1093" href="#1093">1093</a> <em class="jxr_javadoccomment">     * the configuration tree along the specified key. The last existing node on</em>
<a class="jxr_linenumber" name="1094" href="#1094">1094</a> <em class="jxr_javadoccomment">     * this path is returned.</em>
<a class="jxr_linenumber" name="1095" href="#1095">1095</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1096" href="#1096">1096</a> <em class="jxr_javadoccomment">     * @param keyIt the key iterator</em>
<a class="jxr_linenumber" name="1097" href="#1097">1097</a> <em class="jxr_javadoccomment">     * @param node the actual node</em>
<a class="jxr_linenumber" name="1098" href="#1098">1098</a> <em class="jxr_javadoccomment">     * @return the last existing node on the given path</em>
<a class="jxr_linenumber" name="1099" href="#1099">1099</a> <em class="jxr_javadoccomment">     * @deprecated Adding new properties is now to a major part delegated to the</em>
<a class="jxr_linenumber" name="1100" href="#1100">1100</a> <em class="jxr_javadoccomment">     * {@code ExpressionEngine} associated with this configuration instance.</em>
<a class="jxr_linenumber" name="1101" href="#1101">1101</a> <em class="jxr_javadoccomment">     * This method will no longer be called. Developers who want to modify the</em>
<a class="jxr_linenumber" name="1102" href="#1102">1102</a> <em class="jxr_javadoccomment">     * process of adding new properties should consider implementing their own</em>
<a class="jxr_linenumber" name="1103" href="#1103">1103</a> <em class="jxr_javadoccomment">     * expression engine.</em>
<a class="jxr_linenumber" name="1104" href="#1104">1104</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1105" href="#1105">1105</a>     @Deprecated
<a class="jxr_linenumber" name="1106" href="#1106">1106</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> findLastPathNode(ConfigurationKey.KeyIterator keyIt, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="1107" href="#1107">1107</a>     {
<a class="jxr_linenumber" name="1108" href="#1108">1108</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1109" href="#1109">1109</a>     }
<a class="jxr_linenumber" name="1110" href="#1110">1110</a> 
<a class="jxr_linenumber" name="1111" href="#1111">1111</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1112" href="#1112">1112</a> <em class="jxr_javadoccomment">     * Creates the missing nodes for adding a new property. This method ensures</em>
<a class="jxr_linenumber" name="1113" href="#1113">1113</a> <em class="jxr_javadoccomment">     * that there are corresponding nodes for all components of the specified</em>
<a class="jxr_linenumber" name="1114" href="#1114">1114</a> <em class="jxr_javadoccomment">     * configuration key.</em>
<a class="jxr_linenumber" name="1115" href="#1115">1115</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1116" href="#1116">1116</a> <em class="jxr_javadoccomment">     * @param keyIt the key iterator</em>
<a class="jxr_linenumber" name="1117" href="#1117">1117</a> <em class="jxr_javadoccomment">     * @param root the base node of the path to be created</em>
<a class="jxr_linenumber" name="1118" href="#1118">1118</a> <em class="jxr_javadoccomment">     * @return the last node of the path</em>
<a class="jxr_linenumber" name="1119" href="#1119">1119</a> <em class="jxr_javadoccomment">     * @deprecated Adding new properties is now to a major part delegated to the</em>
<a class="jxr_linenumber" name="1120" href="#1120">1120</a> <em class="jxr_javadoccomment">     * {@code ExpressionEngine} associated with this configuration instance.</em>
<a class="jxr_linenumber" name="1121" href="#1121">1121</a> <em class="jxr_javadoccomment">     * This method will no longer be called. Developers who want to modify the</em>
<a class="jxr_linenumber" name="1122" href="#1122">1122</a> <em class="jxr_javadoccomment">     * process of adding new properties should consider implementing their own</em>
<a class="jxr_linenumber" name="1123" href="#1123">1123</a> <em class="jxr_javadoccomment">     * expression engine.</em>
<a class="jxr_linenumber" name="1124" href="#1124">1124</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1125" href="#1125">1125</a>     @Deprecated
<a class="jxr_linenumber" name="1126" href="#1126">1126</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> createAddPath(ConfigurationKey.KeyIterator keyIt, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> root)
<a class="jxr_linenumber" name="1127" href="#1127">1127</a>     {
<a class="jxr_linenumber" name="1128" href="#1128">1128</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1129" href="#1129">1129</a>     }
<a class="jxr_linenumber" name="1130" href="#1130">1130</a> 
<a class="jxr_linenumber" name="1131" href="#1131">1131</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1132" href="#1132">1132</a> <em class="jxr_javadoccomment">     * Creates a new {@code Node} object with the specified name. This</em>
<a class="jxr_linenumber" name="1133" href="#1133">1133</a> <em class="jxr_javadoccomment">     * method can be overloaded in derived classes if a specific node type is</em>
<a class="jxr_linenumber" name="1134" href="#1134">1134</a> <em class="jxr_javadoccomment">     * needed. This base implementation always returns a new object of the</em>
<a class="jxr_linenumber" name="1135" href="#1135">1135</a> <em class="jxr_javadoccomment">     * {@code Node} class.</em>
<a class="jxr_linenumber" name="1136" href="#1136">1136</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1137" href="#1137">1137</a> <em class="jxr_javadoccomment">     * @param name the name of the new node</em>
<a class="jxr_linenumber" name="1138" href="#1138">1138</a> <em class="jxr_javadoccomment">     * @return the new node</em>
<a class="jxr_linenumber" name="1139" href="#1139">1139</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1140" href="#1140">1140</a>     <strong class="jxr_keyword">protected</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> createNode(String name)
<a class="jxr_linenumber" name="1141" href="#1141">1141</a>     {
<a class="jxr_linenumber" name="1142" href="#1142">1142</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(name);
<a class="jxr_linenumber" name="1143" href="#1143">1143</a>     }
<a class="jxr_linenumber" name="1144" href="#1144">1144</a> 
<a class="jxr_linenumber" name="1145" href="#1145">1145</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1146" href="#1146">1146</a> <em class="jxr_javadoccomment">     * Helper method for processing a node add data object obtained from the</em>
<a class="jxr_linenumber" name="1147" href="#1147">1147</a> <em class="jxr_javadoccomment">     * expression engine. This method will create all new nodes.</em>
<a class="jxr_linenumber" name="1148" href="#1148">1148</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1149" href="#1149">1149</a> <em class="jxr_javadoccomment">     * @param data the data object</em>
<a class="jxr_linenumber" name="1150" href="#1150">1150</a> <em class="jxr_javadoccomment">     * @return the new node</em>
<a class="jxr_linenumber" name="1151" href="#1151">1151</a> <em class="jxr_javadoccomment">     * @since 1.3</em>
<a class="jxr_linenumber" name="1152" href="#1152">1152</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1153" href="#1153">1153</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> processNodeAddData(<a href="../../../../org/apache/commons/configuration/tree/NodeAddData.html">NodeAddData</a> data)
<a class="jxr_linenumber" name="1154" href="#1154">1154</a>     {
<a class="jxr_linenumber" name="1155" href="#1155">1155</a>         <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node = data.getParent();
<a class="jxr_linenumber" name="1156" href="#1156">1156</a> 
<a class="jxr_linenumber" name="1157" href="#1157">1157</a>         <em class="jxr_comment">// Create missing nodes on the path</em>
<a class="jxr_linenumber" name="1158" href="#1158">1158</a>         <strong class="jxr_keyword">for</strong> (String name : data.getPathNodes())
<a class="jxr_linenumber" name="1159" href="#1159">1159</a>         {
<a class="jxr_linenumber" name="1160" href="#1160">1160</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> child = createNode(name);
<a class="jxr_linenumber" name="1161" href="#1161">1161</a>             node.addChild(child);
<a class="jxr_linenumber" name="1162" href="#1162">1162</a>             node = child;
<a class="jxr_linenumber" name="1163" href="#1163">1163</a>         }
<a class="jxr_linenumber" name="1164" href="#1164">1164</a> 
<a class="jxr_linenumber" name="1165" href="#1165">1165</a>         <em class="jxr_comment">// Add new target node</em>
<a class="jxr_linenumber" name="1166" href="#1166">1166</a>         <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> child = createNode(data.getNewNodeName());
<a class="jxr_linenumber" name="1167" href="#1167">1167</a>         <strong class="jxr_keyword">if</strong> (data.isAttribute())
<a class="jxr_linenumber" name="1168" href="#1168">1168</a>         {
<a class="jxr_linenumber" name="1169" href="#1169">1169</a>             node.addAttribute(child);
<a class="jxr_linenumber" name="1170" href="#1170">1170</a>         }
<a class="jxr_linenumber" name="1171" href="#1171">1171</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="1172" href="#1172">1172</a>         {
<a class="jxr_linenumber" name="1173" href="#1173">1173</a>             node.addChild(child);
<a class="jxr_linenumber" name="1174" href="#1174">1174</a>         }
<a class="jxr_linenumber" name="1175" href="#1175">1175</a>         <strong class="jxr_keyword">return</strong> child;
<a class="jxr_linenumber" name="1176" href="#1176">1176</a>     }
<a class="jxr_linenumber" name="1177" href="#1177">1177</a> 
<a class="jxr_linenumber" name="1178" href="#1178">1178</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1179" href="#1179">1179</a> <em class="jxr_javadoccomment">     * Clears all reference fields in a node structure. A configuration node can</em>
<a class="jxr_linenumber" name="1180" href="#1180">1180</a> <em class="jxr_javadoccomment">     * store a so-called &amp;quot;reference&amp;quot;. The meaning of this data is</em>
<a class="jxr_linenumber" name="1181" href="#1181">1181</a> <em class="jxr_javadoccomment">     * determined by a concrete sub class. Typically such references are</em>
<a class="jxr_linenumber" name="1182" href="#1182">1182</a> <em class="jxr_javadoccomment">     * specific for a configuration instance. If this instance is cloned or</em>
<a class="jxr_linenumber" name="1183" href="#1183">1183</a> <em class="jxr_javadoccomment">     * copied, they must be cleared. This can be done using this method.</em>
<a class="jxr_linenumber" name="1184" href="#1184">1184</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1185" href="#1185">1185</a> <em class="jxr_javadoccomment">     * @param node the root node of the node hierarchy, in which the references</em>
<a class="jxr_linenumber" name="1186" href="#1186">1186</a> <em class="jxr_javadoccomment">     * are to be cleared</em>
<a class="jxr_linenumber" name="1187" href="#1187">1187</a> <em class="jxr_javadoccomment">     * @since 1.4</em>
<a class="jxr_linenumber" name="1188" href="#1188">1188</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1189" href="#1189">1189</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> clearReferences(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1190" href="#1190">1190</a>     {
<a class="jxr_linenumber" name="1191" href="#1191">1191</a>         node.visit(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNodeVisitorAdapter.html">ConfigurationNodeVisitorAdapter</a>()
<a class="jxr_linenumber" name="1192" href="#1192">1192</a>         {
<a class="jxr_linenumber" name="1193" href="#1193">1193</a>             @Override
<a class="jxr_linenumber" name="1194" href="#1194">1194</a>             <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1195" href="#1195">1195</a>             {
<a class="jxr_linenumber" name="1196" href="#1196">1196</a>                 node.setReference(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="1197" href="#1197">1197</a>             }
<a class="jxr_linenumber" name="1198" href="#1198">1198</a>         });
<a class="jxr_linenumber" name="1199" href="#1199">1199</a>     }
<a class="jxr_linenumber" name="1200" href="#1200">1200</a> 
<a class="jxr_linenumber" name="1201" href="#1201">1201</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1202" href="#1202">1202</a> <em class="jxr_javadoccomment">     * Transforms the specified object into a Node. This method treats view</em>
<a class="jxr_linenumber" name="1203" href="#1203">1203</a> <em class="jxr_javadoccomment">     * nodes in a special way. This is necessary because ViewNode does not</em>
<a class="jxr_linenumber" name="1204" href="#1204">1204</a> <em class="jxr_javadoccomment">     * extend HierarchicalConfiguration.Node; thus the API for the node visitor</em>
<a class="jxr_linenumber" name="1205" href="#1205">1205</a> <em class="jxr_javadoccomment">     * is slightly different. Therefore a view node is transformed into a</em>
<a class="jxr_linenumber" name="1206" href="#1206">1206</a> <em class="jxr_javadoccomment">     * special compatibility Node object.</em>
<a class="jxr_linenumber" name="1207" href="#1207">1207</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1208" href="#1208">1208</a> <em class="jxr_javadoccomment">     * @param obj the original node object</em>
<a class="jxr_linenumber" name="1209" href="#1209">1209</a> <em class="jxr_javadoccomment">     * @return the node to be used</em>
<a class="jxr_linenumber" name="1210" href="#1210">1210</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1211" href="#1211">1211</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> getNodeFor(Object obj)
<a class="jxr_linenumber" name="1212" href="#1212">1212</a>     {
<a class="jxr_linenumber" name="1213" href="#1213">1213</a>         <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> nd;
<a class="jxr_linenumber" name="1214" href="#1214">1214</a>         <strong class="jxr_keyword">if</strong> (obj instanceof ViewNode)
<a class="jxr_linenumber" name="1215" href="#1215">1215</a>         {
<a class="jxr_linenumber" name="1216" href="#1216">1216</a>             <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a> viewNode = (ViewNode) obj;
<a class="jxr_linenumber" name="1217" href="#1217">1217</a>             nd = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(viewNode)
<a class="jxr_linenumber" name="1218" href="#1218">1218</a>             {
<a class="jxr_linenumber" name="1219" href="#1219">1219</a>                 @Override
<a class="jxr_linenumber" name="1220" href="#1220">1220</a>                 <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setReference(Object reference)
<a class="jxr_linenumber" name="1221" href="#1221">1221</a>                 {
<a class="jxr_linenumber" name="1222" href="#1222">1222</a>                     <strong class="jxr_keyword">super</strong>.setReference(reference);
<a class="jxr_linenumber" name="1223" href="#1223">1223</a>                     <em class="jxr_comment">// also set the reference at the original node</em>
<a class="jxr_linenumber" name="1224" href="#1224">1224</a>                     viewNode.setReference(reference);
<a class="jxr_linenumber" name="1225" href="#1225">1225</a>                 }
<a class="jxr_linenumber" name="1226" href="#1226">1226</a>             };
<a class="jxr_linenumber" name="1227" href="#1227">1227</a>         }
<a class="jxr_linenumber" name="1228" href="#1228">1228</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="1229" href="#1229">1229</a>         {
<a class="jxr_linenumber" name="1230" href="#1230">1230</a>             nd = (Node) obj;
<a class="jxr_linenumber" name="1231" href="#1231">1231</a>         }
<a class="jxr_linenumber" name="1232" href="#1232">1232</a>         <strong class="jxr_keyword">return</strong> nd;
<a class="jxr_linenumber" name="1233" href="#1233">1233</a>     }
<a class="jxr_linenumber" name="1234" href="#1234">1234</a> 
<a class="jxr_linenumber" name="1235" href="#1235">1235</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1236" href="#1236">1236</a> <em class="jxr_javadoccomment">     * A data class for storing (hierarchical) property information. A property</em>
<a class="jxr_linenumber" name="1237" href="#1237">1237</a> <em class="jxr_javadoccomment">     * can have a value and an arbitrary number of child properties. From</em>
<a class="jxr_linenumber" name="1238" href="#1238">1238</a> <em class="jxr_javadoccomment">     * version 1.3 on this class is only a thin wrapper over the</em>
<a class="jxr_linenumber" name="1239" href="#1239">1239</a> <em class="jxr_javadoccomment">     * {@link org.apache.commons.configuration.tree.DefaultConfigurationNode DefaultconfigurationNode}</em>
<a class="jxr_linenumber" name="1240" href="#1240">1240</a> <em class="jxr_javadoccomment">     * class that exists mainly for the purpose of backwards compatibility.</em>
<a class="jxr_linenumber" name="1241" href="#1241">1241</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1242" href="#1242">1242</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultConfigurationNode.html">DefaultConfigurationNode</a> <strong class="jxr_keyword">implements</strong> Serializable
<a class="jxr_linenumber" name="1243" href="#1243">1243</a>     {
<a class="jxr_linenumber" name="1244" href="#1244">1244</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1245" href="#1245">1245</a> <em class="jxr_javadoccomment">         * The serial version UID.</em>
<a class="jxr_linenumber" name="1246" href="#1246">1246</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1247" href="#1247">1247</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = -6357500633536941775L;
<a class="jxr_linenumber" name="1248" href="#1248">1248</a> 
<a class="jxr_linenumber" name="1249" href="#1249">1249</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1250" href="#1250">1250</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code Node}.</em>
<a class="jxr_linenumber" name="1251" href="#1251">1251</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1252" href="#1252">1252</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>()
<a class="jxr_linenumber" name="1253" href="#1253">1253</a>         {
<a class="jxr_linenumber" name="1254" href="#1254">1254</a>             <strong class="jxr_keyword">super</strong>();
<a class="jxr_linenumber" name="1255" href="#1255">1255</a>         }
<a class="jxr_linenumber" name="1256" href="#1256">1256</a> 
<a class="jxr_linenumber" name="1257" href="#1257">1257</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1258" href="#1258">1258</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code Node} and sets the name.</em>
<a class="jxr_linenumber" name="1259" href="#1259">1259</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1260" href="#1260">1260</a> <em class="jxr_javadoccomment">         * @param name the node's name</em>
<a class="jxr_linenumber" name="1261" href="#1261">1261</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1262" href="#1262">1262</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(String name)
<a class="jxr_linenumber" name="1263" href="#1263">1263</a>         {
<a class="jxr_linenumber" name="1264" href="#1264">1264</a>             <strong class="jxr_keyword">super</strong>(name);
<a class="jxr_linenumber" name="1265" href="#1265">1265</a>         }
<a class="jxr_linenumber" name="1266" href="#1266">1266</a> 
<a class="jxr_linenumber" name="1267" href="#1267">1267</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1268" href="#1268">1268</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code Node} and sets the name and the value.</em>
<a class="jxr_linenumber" name="1269" href="#1269">1269</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1270" href="#1270">1270</a> <em class="jxr_javadoccomment">         * @param name the node's name</em>
<a class="jxr_linenumber" name="1271" href="#1271">1271</a> <em class="jxr_javadoccomment">         * @param value the value</em>
<a class="jxr_linenumber" name="1272" href="#1272">1272</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1273" href="#1273">1273</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(String name, Object value)
<a class="jxr_linenumber" name="1274" href="#1274">1274</a>         {
<a class="jxr_linenumber" name="1275" href="#1275">1275</a>             <strong class="jxr_keyword">super</strong>(name, value);
<a class="jxr_linenumber" name="1276" href="#1276">1276</a>         }
<a class="jxr_linenumber" name="1277" href="#1277">1277</a> 
<a class="jxr_linenumber" name="1278" href="#1278">1278</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1279" href="#1279">1279</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code Node} based on the given</em>
<a class="jxr_linenumber" name="1280" href="#1280">1280</a> <em class="jxr_javadoccomment">         * source node. All properties of the source node, including its</em>
<a class="jxr_linenumber" name="1281" href="#1281">1281</a> <em class="jxr_javadoccomment">         * children and attributes, will be copied.</em>
<a class="jxr_linenumber" name="1282" href="#1282">1282</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1283" href="#1283">1283</a> <em class="jxr_javadoccomment">         * @param src the node to be copied</em>
<a class="jxr_linenumber" name="1284" href="#1284">1284</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1285" href="#1285">1285</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a>(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> src)
<a class="jxr_linenumber" name="1286" href="#1286">1286</a>         {
<a class="jxr_linenumber" name="1287" href="#1287">1287</a>             <strong class="jxr_keyword">this</strong>(src.getName(), src.getValue());
<a class="jxr_linenumber" name="1288" href="#1288">1288</a>             setReference(src.getReference());
<a class="jxr_linenumber" name="1289" href="#1289">1289</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode nd : src.getChildren())
<a class="jxr_linenumber" name="1290" href="#1290">1290</a>             {
<a class="jxr_linenumber" name="1291" href="#1291">1291</a>                 <em class="jxr_comment">// Don't change the parent node</em>
<a class="jxr_linenumber" name="1292" href="#1292">1292</a>                 <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> parent = nd.getParentNode();
<a class="jxr_linenumber" name="1293" href="#1293">1293</a>                 addChild(nd);
<a class="jxr_linenumber" name="1294" href="#1294">1294</a>                 nd.setParentNode(parent);
<a class="jxr_linenumber" name="1295" href="#1295">1295</a>             }
<a class="jxr_linenumber" name="1296" href="#1296">1296</a> 
<a class="jxr_linenumber" name="1297" href="#1297">1297</a>             <strong class="jxr_keyword">for</strong> (ConfigurationNode nd : src.getAttributes())
<a class="jxr_linenumber" name="1298" href="#1298">1298</a>             {
<a class="jxr_linenumber" name="1299" href="#1299">1299</a>                 <em class="jxr_comment">// Don't change the parent node</em>
<a class="jxr_linenumber" name="1300" href="#1300">1300</a>                 <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> parent = nd.getParentNode();
<a class="jxr_linenumber" name="1301" href="#1301">1301</a>                 addAttribute(nd);
<a class="jxr_linenumber" name="1302" href="#1302">1302</a>                 nd.setParentNode(parent);
<a class="jxr_linenumber" name="1303" href="#1303">1303</a>             }
<a class="jxr_linenumber" name="1304" href="#1304">1304</a>         }
<a class="jxr_linenumber" name="1305" href="#1305">1305</a> 
<a class="jxr_linenumber" name="1306" href="#1306">1306</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1307" href="#1307">1307</a> <em class="jxr_javadoccomment">         * Returns the parent of this node.</em>
<a class="jxr_linenumber" name="1308" href="#1308">1308</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1309" href="#1309">1309</a> <em class="jxr_javadoccomment">         * @return this node's parent (can be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="1310" href="#1310">1310</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1311" href="#1311">1311</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> getParent()
<a class="jxr_linenumber" name="1312" href="#1312">1312</a>         {
<a class="jxr_linenumber" name="1313" href="#1313">1313</a>             <strong class="jxr_keyword">return</strong> (Node) getParentNode();
<a class="jxr_linenumber" name="1314" href="#1314">1314</a>         }
<a class="jxr_linenumber" name="1315" href="#1315">1315</a> 
<a class="jxr_linenumber" name="1316" href="#1316">1316</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1317" href="#1317">1317</a> <em class="jxr_javadoccomment">         * Sets the parent of this node.</em>
<a class="jxr_linenumber" name="1318" href="#1318">1318</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1319" href="#1319">1319</a> <em class="jxr_javadoccomment">         * @param node the parent node</em>
<a class="jxr_linenumber" name="1320" href="#1320">1320</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1321" href="#1321">1321</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setParent(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="1322" href="#1322">1322</a>         {
<a class="jxr_linenumber" name="1323" href="#1323">1323</a>             setParentNode(node);
<a class="jxr_linenumber" name="1324" href="#1324">1324</a>         }
<a class="jxr_linenumber" name="1325" href="#1325">1325</a> 
<a class="jxr_linenumber" name="1326" href="#1326">1326</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1327" href="#1327">1327</a> <em class="jxr_javadoccomment">         * Adds the given node to the children of this node.</em>
<a class="jxr_linenumber" name="1328" href="#1328">1328</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1329" href="#1329">1329</a> <em class="jxr_javadoccomment">         * @param node the child to be added</em>
<a class="jxr_linenumber" name="1330" href="#1330">1330</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1331" href="#1331">1331</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addChild(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node)
<a class="jxr_linenumber" name="1332" href="#1332">1332</a>         {
<a class="jxr_linenumber" name="1333" href="#1333">1333</a>             addChild((ConfigurationNode) node);
<a class="jxr_linenumber" name="1334" href="#1334">1334</a>         }
<a class="jxr_linenumber" name="1335" href="#1335">1335</a> 
<a class="jxr_linenumber" name="1336" href="#1336">1336</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1337" href="#1337">1337</a> <em class="jxr_javadoccomment">         * Returns a flag whether this node has child elements.</em>
<a class="jxr_linenumber" name="1338" href="#1338">1338</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1339" href="#1339">1339</a> <em class="jxr_javadoccomment">         * @return &lt;b&gt;true&lt;/b&gt; if there is a child node, &lt;b&gt;false&lt;/b&gt; otherwise</em>
<a class="jxr_linenumber" name="1340" href="#1340">1340</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1341" href="#1341">1341</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> hasChildren()
<a class="jxr_linenumber" name="1342" href="#1342">1342</a>         {
<a class="jxr_linenumber" name="1343" href="#1343">1343</a>             <strong class="jxr_keyword">return</strong> getChildrenCount() &gt; 0 || getAttributeCount() &gt; 0;
<a class="jxr_linenumber" name="1344" href="#1344">1344</a>         }
<a class="jxr_linenumber" name="1345" href="#1345">1345</a> 
<a class="jxr_linenumber" name="1346" href="#1346">1346</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1347" href="#1347">1347</a> <em class="jxr_javadoccomment">         * Removes the specified child from this node.</em>
<a class="jxr_linenumber" name="1348" href="#1348">1348</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1349" href="#1349">1349</a> <em class="jxr_javadoccomment">         * @param child the child node to be removed</em>
<a class="jxr_linenumber" name="1350" href="#1350">1350</a> <em class="jxr_javadoccomment">         * @return a flag if the child could be found</em>
<a class="jxr_linenumber" name="1351" href="#1351">1351</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1352" href="#1352">1352</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> remove(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> child)
<a class="jxr_linenumber" name="1353" href="#1353">1353</a>         {
<a class="jxr_linenumber" name="1354" href="#1354">1354</a>             <strong class="jxr_keyword">return</strong> child.isAttribute() ? removeAttribute(child) : removeChild(child);
<a class="jxr_linenumber" name="1355" href="#1355">1355</a>         }
<a class="jxr_linenumber" name="1356" href="#1356">1356</a> 
<a class="jxr_linenumber" name="1357" href="#1357">1357</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1358" href="#1358">1358</a> <em class="jxr_javadoccomment">         * Removes all children with the given name.</em>
<a class="jxr_linenumber" name="1359" href="#1359">1359</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1360" href="#1360">1360</a> <em class="jxr_javadoccomment">         * @param name the name of the children to be removed</em>
<a class="jxr_linenumber" name="1361" href="#1361">1361</a> <em class="jxr_javadoccomment">         * @return a flag if children with this name existed</em>
<a class="jxr_linenumber" name="1362" href="#1362">1362</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1363" href="#1363">1363</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> remove(String name)
<a class="jxr_linenumber" name="1364" href="#1364">1364</a>         {
<a class="jxr_linenumber" name="1365" href="#1365">1365</a>             <strong class="jxr_keyword">boolean</strong> childrenRemoved = removeChild(name);
<a class="jxr_linenumber" name="1366" href="#1366">1366</a>             <strong class="jxr_keyword">boolean</strong> attrsRemoved = removeAttribute(name);
<a class="jxr_linenumber" name="1367" href="#1367">1367</a>             <strong class="jxr_keyword">return</strong> childrenRemoved || attrsRemoved;
<a class="jxr_linenumber" name="1368" href="#1368">1368</a>         }
<a class="jxr_linenumber" name="1369" href="#1369">1369</a> 
<a class="jxr_linenumber" name="1370" href="#1370">1370</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1371" href="#1371">1371</a> <em class="jxr_javadoccomment">         * A generic method for traversing this node and all of its children.</em>
<a class="jxr_linenumber" name="1372" href="#1372">1372</a> <em class="jxr_javadoccomment">         * This method sends the passed in visitor to this node and all of its</em>
<a class="jxr_linenumber" name="1373" href="#1373">1373</a> <em class="jxr_javadoccomment">         * children.</em>
<a class="jxr_linenumber" name="1374" href="#1374">1374</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1375" href="#1375">1375</a> <em class="jxr_javadoccomment">         * @param visitor the visitor</em>
<a class="jxr_linenumber" name="1376" href="#1376">1376</a> <em class="jxr_javadoccomment">         * @param key here a configuration key with the name of the root node of</em>
<a class="jxr_linenumber" name="1377" href="#1377">1377</a> <em class="jxr_javadoccomment">         * the iteration can be passed; if this key is not &lt;b&gt;null &lt;/b&gt;, the</em>
<a class="jxr_linenumber" name="1378" href="#1378">1378</a> <em class="jxr_javadoccomment">         * full paths to the visited nodes are builded and passed to the</em>
<a class="jxr_linenumber" name="1379" href="#1379">1379</a> <em class="jxr_javadoccomment">         * visitor's {@code visit()} methods</em>
<a class="jxr_linenumber" name="1380" href="#1380">1380</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1381" href="#1381">1381</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visit(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">NodeVisitor</a> visitor, <a href="../../../../org/apache/commons/configuration/ConfigurationKey.html">ConfigurationKey</a> key)
<a class="jxr_linenumber" name="1382" href="#1382">1382</a>         {
<a class="jxr_linenumber" name="1383" href="#1383">1383</a>             <strong class="jxr_keyword">int</strong> length = 0;
<a class="jxr_linenumber" name="1384" href="#1384">1384</a>             <strong class="jxr_keyword">if</strong> (key != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1385" href="#1385">1385</a>             {
<a class="jxr_linenumber" name="1386" href="#1386">1386</a>                 length = key.length();
<a class="jxr_linenumber" name="1387" href="#1387">1387</a>                 <strong class="jxr_keyword">if</strong> (getName() != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1388" href="#1388">1388</a>                 {
<a class="jxr_linenumber" name="1389" href="#1389">1389</a>                     key
<a class="jxr_linenumber" name="1390" href="#1390">1390</a>                             .append(StringUtils
<a class="jxr_linenumber" name="1391" href="#1391">1391</a>                                     .replace(
<a class="jxr_linenumber" name="1392" href="#1392">1392</a>                                             isAttribute() ? ConfigurationKey
<a class="jxr_linenumber" name="1393" href="#1393">1393</a>                                                     .constructAttributeKey(getName())
<a class="jxr_linenumber" name="1394" href="#1394">1394</a>                                                     : getName(),
<a class="jxr_linenumber" name="1395" href="#1395">1395</a>                                             String
<a class="jxr_linenumber" name="1396" href="#1396">1396</a>                                                     .valueOf(ConfigurationKey.PROPERTY_DELIMITER),
<a class="jxr_linenumber" name="1397" href="#1397">1397</a>                                             ConfigurationKey.ESCAPED_DELIMITER));
<a class="jxr_linenumber" name="1398" href="#1398">1398</a>                 }
<a class="jxr_linenumber" name="1399" href="#1399">1399</a>             }
<a class="jxr_linenumber" name="1400" href="#1400">1400</a> 
<a class="jxr_linenumber" name="1401" href="#1401">1401</a>             visitor.visitBeforeChildren(<strong class="jxr_keyword">this</strong>, key);
<a class="jxr_linenumber" name="1402" href="#1402">1402</a> 
<a class="jxr_linenumber" name="1403" href="#1403">1403</a>             <strong class="jxr_keyword">for</strong> (Iterator&lt;ConfigurationNode&gt; it = getChildren().iterator(); it.hasNext()
<a class="jxr_linenumber" name="1404" href="#1404">1404</a>                     &amp;&amp; !visitor.terminate();)
<a class="jxr_linenumber" name="1405" href="#1405">1405</a>             {
<a class="jxr_linenumber" name="1406" href="#1406">1406</a>                 Object obj = it.next();
<a class="jxr_linenumber" name="1407" href="#1407">1407</a>                 getNodeFor(obj).visit(visitor, key);
<a class="jxr_linenumber" name="1408" href="#1408">1408</a>             }
<a class="jxr_linenumber" name="1409" href="#1409">1409</a>             <strong class="jxr_keyword">for</strong> (Iterator&lt;ConfigurationNode&gt; it = getAttributes().iterator(); it.hasNext()
<a class="jxr_linenumber" name="1410" href="#1410">1410</a>                     &amp;&amp; !visitor.terminate();)
<a class="jxr_linenumber" name="1411" href="#1411">1411</a>             {
<a class="jxr_linenumber" name="1412" href="#1412">1412</a>                 Object obj = it.next();
<a class="jxr_linenumber" name="1413" href="#1413">1413</a>                 getNodeFor(obj).visit(visitor, key);
<a class="jxr_linenumber" name="1414" href="#1414">1414</a>             }
<a class="jxr_linenumber" name="1415" href="#1415">1415</a> 
<a class="jxr_linenumber" name="1416" href="#1416">1416</a>             visitor.visitAfterChildren(<strong class="jxr_keyword">this</strong>, key);
<a class="jxr_linenumber" name="1417" href="#1417">1417</a>             <strong class="jxr_keyword">if</strong> (key != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1418" href="#1418">1418</a>             {
<a class="jxr_linenumber" name="1419" href="#1419">1419</a>                 key.setLength(length);
<a class="jxr_linenumber" name="1420" href="#1420">1420</a>             }
<a class="jxr_linenumber" name="1421" href="#1421">1421</a>         }
<a class="jxr_linenumber" name="1422" href="#1422">1422</a>     }
<a class="jxr_linenumber" name="1423" href="#1423">1423</a> 
<a class="jxr_linenumber" name="1424" href="#1424">1424</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1425" href="#1425">1425</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Definition of a visitor class for traversing a node and all of its</em>
<a class="jxr_linenumber" name="1426" href="#1426">1426</a> <em class="jxr_javadoccomment">     * children.&lt;/p&gt;&lt;p&gt;This class defines the interface of a visitor for</em>
<a class="jxr_linenumber" name="1427" href="#1427">1427</a> <em class="jxr_javadoccomment">     * {@code Node} objects and provides a default implementation. The</em>
<a class="jxr_linenumber" name="1428" href="#1428">1428</a> <em class="jxr_javadoccomment">     * method {@code visit()} of {@code Node} implements a generic</em>
<a class="jxr_linenumber" name="1429" href="#1429">1429</a> <em class="jxr_javadoccomment">     * iteration algorithm based on the &lt;em&gt;Visitor&lt;/em&gt; pattern. By providing</em>
<a class="jxr_linenumber" name="1430" href="#1430">1430</a> <em class="jxr_javadoccomment">     * different implementations of visitors it is possible to collect different</em>
<a class="jxr_linenumber" name="1431" href="#1431">1431</a> <em class="jxr_javadoccomment">     * data during the iteration process.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="1432" href="#1432">1432</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1433" href="#1433">1433</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1434" href="#1434">1434</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">NodeVisitor</a>
<a class="jxr_linenumber" name="1435" href="#1435">1435</a>     {
<a class="jxr_linenumber" name="1436" href="#1436">1436</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1437" href="#1437">1437</a> <em class="jxr_javadoccomment">         * Visits the specified node. This method is called during iteration for</em>
<a class="jxr_linenumber" name="1438" href="#1438">1438</a> <em class="jxr_javadoccomment">         * each node before its children have been visited.</em>
<a class="jxr_linenumber" name="1439" href="#1439">1439</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1440" href="#1440">1440</a> <em class="jxr_javadoccomment">         * @param node the actual node</em>
<a class="jxr_linenumber" name="1441" href="#1441">1441</a> <em class="jxr_javadoccomment">         * @param key the key of this node (may be &lt;b&gt;null &lt;/b&gt;)</em>
<a class="jxr_linenumber" name="1442" href="#1442">1442</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1443" href="#1443">1443</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node, <a href="../../../../org/apache/commons/configuration/ConfigurationKey.html">ConfigurationKey</a> key)
<a class="jxr_linenumber" name="1444" href="#1444">1444</a>         {
<a class="jxr_linenumber" name="1445" href="#1445">1445</a>         }
<a class="jxr_linenumber" name="1446" href="#1446">1446</a> 
<a class="jxr_linenumber" name="1447" href="#1447">1447</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1448" href="#1448">1448</a> <em class="jxr_javadoccomment">         * Visits the specified node after its children have been processed.</em>
<a class="jxr_linenumber" name="1449" href="#1449">1449</a> <em class="jxr_javadoccomment">         * This gives a visitor the opportunity of collecting additional data</em>
<a class="jxr_linenumber" name="1450" href="#1450">1450</a> <em class="jxr_javadoccomment">         * after the child nodes have been visited.</em>
<a class="jxr_linenumber" name="1451" href="#1451">1451</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1452" href="#1452">1452</a> <em class="jxr_javadoccomment">         * @param node the node to be visited</em>
<a class="jxr_linenumber" name="1453" href="#1453">1453</a> <em class="jxr_javadoccomment">         * @param key the key of this node (may be &lt;b&gt;null &lt;/b&gt;)</em>
<a class="jxr_linenumber" name="1454" href="#1454">1454</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1455" href="#1455">1455</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitAfterChildren(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node, <a href="../../../../org/apache/commons/configuration/ConfigurationKey.html">ConfigurationKey</a> key)
<a class="jxr_linenumber" name="1456" href="#1456">1456</a>         {
<a class="jxr_linenumber" name="1457" href="#1457">1457</a>         }
<a class="jxr_linenumber" name="1458" href="#1458">1458</a> 
<a class="jxr_linenumber" name="1459" href="#1459">1459</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1460" href="#1460">1460</a> <em class="jxr_javadoccomment">         * Returns a flag that indicates if iteration should be stopped. This</em>
<a class="jxr_linenumber" name="1461" href="#1461">1461</a> <em class="jxr_javadoccomment">         * method is called after each visited node. It can be useful for</em>
<a class="jxr_linenumber" name="1462" href="#1462">1462</a> <em class="jxr_javadoccomment">         * visitors that search a specific node. If this node is found, the</em>
<a class="jxr_linenumber" name="1463" href="#1463">1463</a> <em class="jxr_javadoccomment">         * whole process can be stopped. This base implementation always returns</em>
<a class="jxr_linenumber" name="1464" href="#1464">1464</a> <em class="jxr_javadoccomment">         * &lt;b&gt;false &lt;/b&gt;.</em>
<a class="jxr_linenumber" name="1465" href="#1465">1465</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1466" href="#1466">1466</a> <em class="jxr_javadoccomment">         * @return a flag if iteration should be stopped</em>
<a class="jxr_linenumber" name="1467" href="#1467">1467</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1468" href="#1468">1468</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> terminate()
<a class="jxr_linenumber" name="1469" href="#1469">1469</a>         {
<a class="jxr_linenumber" name="1470" href="#1470">1470</a>             <strong class="jxr_keyword">return</strong> false;
<a class="jxr_linenumber" name="1471" href="#1471">1471</a>         }
<a class="jxr_linenumber" name="1472" href="#1472">1472</a>     }
<a class="jxr_linenumber" name="1473" href="#1473">1473</a> 
<a class="jxr_linenumber" name="1474" href="#1474">1474</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1475" href="#1475">1475</a> <em class="jxr_javadoccomment">     * A specialized visitor that checks if a node is defined.</em>
<a class="jxr_linenumber" name="1476" href="#1476">1476</a> <em class="jxr_javadoccomment">     * &amp;quot;Defined&amp;quot; in this terms means that the node or at least one of</em>
<a class="jxr_linenumber" name="1477" href="#1477">1477</a> <em class="jxr_javadoccomment">     * its sub nodes is associated with a value.</em>
<a class="jxr_linenumber" name="1478" href="#1478">1478</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1479" href="#1479">1479</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1480" href="#1480">1480</a>     <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedVisitor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNodeVisitorAdapter.html">ConfigurationNodeVisitorAdapter</a>
<a class="jxr_linenumber" name="1481" href="#1481">1481</a>     {
<a class="jxr_linenumber" name="1482" href="#1482">1482</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the defined flag. */</em>
<a class="jxr_linenumber" name="1483" href="#1483">1483</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> defined;
<a class="jxr_linenumber" name="1484" href="#1484">1484</a> 
<a class="jxr_linenumber" name="1485" href="#1485">1485</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1486" href="#1486">1486</a> <em class="jxr_javadoccomment">         * Checks if iteration should be stopped. This can be done if the first</em>
<a class="jxr_linenumber" name="1487" href="#1487">1487</a> <em class="jxr_javadoccomment">         * defined node is found.</em>
<a class="jxr_linenumber" name="1488" href="#1488">1488</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1489" href="#1489">1489</a> <em class="jxr_javadoccomment">         * @return a flag if iteration should be stopped</em>
<a class="jxr_linenumber" name="1490" href="#1490">1490</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1491" href="#1491">1491</a>         @Override
<a class="jxr_linenumber" name="1492" href="#1492">1492</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> terminate()
<a class="jxr_linenumber" name="1493" href="#1493">1493</a>         {
<a class="jxr_linenumber" name="1494" href="#1494">1494</a>             <strong class="jxr_keyword">return</strong> isDefined();
<a class="jxr_linenumber" name="1495" href="#1495">1495</a>         }
<a class="jxr_linenumber" name="1496" href="#1496">1496</a> 
<a class="jxr_linenumber" name="1497" href="#1497">1497</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1498" href="#1498">1498</a> <em class="jxr_javadoccomment">         * Visits the node. Checks if a value is defined.</em>
<a class="jxr_linenumber" name="1499" href="#1499">1499</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1500" href="#1500">1500</a> <em class="jxr_javadoccomment">         * @param node the actual node</em>
<a class="jxr_linenumber" name="1501" href="#1501">1501</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1502" href="#1502">1502</a>         @Override
<a class="jxr_linenumber" name="1503" href="#1503">1503</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1504" href="#1504">1504</a>         {
<a class="jxr_linenumber" name="1505" href="#1505">1505</a>             defined = node.getValue() != <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1506" href="#1506">1506</a>         }
<a class="jxr_linenumber" name="1507" href="#1507">1507</a> 
<a class="jxr_linenumber" name="1508" href="#1508">1508</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1509" href="#1509">1509</a> <em class="jxr_javadoccomment">         * Returns the defined flag.</em>
<a class="jxr_linenumber" name="1510" href="#1510">1510</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1511" href="#1511">1511</a> <em class="jxr_javadoccomment">         * @return the defined flag</em>
<a class="jxr_linenumber" name="1512" href="#1512">1512</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1513" href="#1513">1513</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isDefined()
<a class="jxr_linenumber" name="1514" href="#1514">1514</a>         {
<a class="jxr_linenumber" name="1515" href="#1515">1515</a>             <strong class="jxr_keyword">return</strong> defined;
<a class="jxr_linenumber" name="1516" href="#1516">1516</a>         }
<a class="jxr_linenumber" name="1517" href="#1517">1517</a>     }
<a class="jxr_linenumber" name="1518" href="#1518">1518</a> 
<a class="jxr_linenumber" name="1519" href="#1519">1519</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1520" href="#1520">1520</a> <em class="jxr_javadoccomment">     * A specialized visitor that fills a list with keys that are defined in a</em>
<a class="jxr_linenumber" name="1521" href="#1521">1521</a> <em class="jxr_javadoccomment">     * node hierarchy.</em>
<a class="jxr_linenumber" name="1522" href="#1522">1522</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1523" href="#1523">1523</a>     <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNodeVisitorAdapter.html">ConfigurationNodeVisitorAdapter</a>
<a class="jxr_linenumber" name="1524" href="#1524">1524</a>     {
<a class="jxr_linenumber" name="1525" href="#1525">1525</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the list to be filled. */</em>
<a class="jxr_linenumber" name="1526" href="#1526">1526</a>         <strong class="jxr_keyword">private</strong> Set&lt;String&gt; keyList;
<a class="jxr_linenumber" name="1527" href="#1527">1527</a> 
<a class="jxr_linenumber" name="1528" href="#1528">1528</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A stack with the keys of the already processed nodes. */</em>
<a class="jxr_linenumber" name="1529" href="#1529">1529</a>         <strong class="jxr_keyword">private</strong> Stack&lt;String&gt; parentKeys;
<a class="jxr_linenumber" name="1530" href="#1530">1530</a> 
<a class="jxr_linenumber" name="1531" href="#1531">1531</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1532" href="#1532">1532</a> <em class="jxr_javadoccomment">         * Default constructor.</em>
<a class="jxr_linenumber" name="1533" href="#1533">1533</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1534" href="#1534">1534</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a>()
<a class="jxr_linenumber" name="1535" href="#1535">1535</a>         {
<a class="jxr_linenumber" name="1536" href="#1536">1536</a>             keyList = <strong class="jxr_keyword">new</strong> LinkedHashSet&lt;String&gt;();
<a class="jxr_linenumber" name="1537" href="#1537">1537</a>             parentKeys = <strong class="jxr_keyword">new</strong> Stack&lt;String&gt;();
<a class="jxr_linenumber" name="1538" href="#1538">1538</a>         }
<a class="jxr_linenumber" name="1539" href="#1539">1539</a> 
<a class="jxr_linenumber" name="1540" href="#1540">1540</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1541" href="#1541">1541</a> <em class="jxr_javadoccomment">         * Creates a new {@code DefinedKeysVisitor} instance and sets the</em>
<a class="jxr_linenumber" name="1542" href="#1542">1542</a> <em class="jxr_javadoccomment">         * prefix for the keys to fetch.</em>
<a class="jxr_linenumber" name="1543" href="#1543">1543</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1544" href="#1544">1544</a> <em class="jxr_javadoccomment">         * @param prefix the prefix</em>
<a class="jxr_linenumber" name="1545" href="#1545">1545</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1546" href="#1546">1546</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">DefinedKeysVisitor</a>(String prefix)
<a class="jxr_linenumber" name="1547" href="#1547">1547</a>         {
<a class="jxr_linenumber" name="1548" href="#1548">1548</a>             <strong class="jxr_keyword">this</strong>();
<a class="jxr_linenumber" name="1549" href="#1549">1549</a>             parentKeys.push(prefix);
<a class="jxr_linenumber" name="1550" href="#1550">1550</a>         }
<a class="jxr_linenumber" name="1551" href="#1551">1551</a> 
<a class="jxr_linenumber" name="1552" href="#1552">1552</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1553" href="#1553">1553</a> <em class="jxr_javadoccomment">         * Returns the list with all defined keys.</em>
<a class="jxr_linenumber" name="1554" href="#1554">1554</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1555" href="#1555">1555</a> <em class="jxr_javadoccomment">         * @return the list with the defined keys</em>
<a class="jxr_linenumber" name="1556" href="#1556">1556</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1557" href="#1557">1557</a>         <strong class="jxr_keyword">public</strong> Set&lt;String&gt; getKeyList()
<a class="jxr_linenumber" name="1558" href="#1558">1558</a>         {
<a class="jxr_linenumber" name="1559" href="#1559">1559</a>             <strong class="jxr_keyword">return</strong> keyList;
<a class="jxr_linenumber" name="1560" href="#1560">1560</a>         }
<a class="jxr_linenumber" name="1561" href="#1561">1561</a> 
<a class="jxr_linenumber" name="1562" href="#1562">1562</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1563" href="#1563">1563</a> <em class="jxr_javadoccomment">         * Visits the node after its children has been processed. Removes this</em>
<a class="jxr_linenumber" name="1564" href="#1564">1564</a> <em class="jxr_javadoccomment">         * node's key from the stack.</em>
<a class="jxr_linenumber" name="1565" href="#1565">1565</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1566" href="#1566">1566</a> <em class="jxr_javadoccomment">         * @param node the node</em>
<a class="jxr_linenumber" name="1567" href="#1567">1567</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1568" href="#1568">1568</a>         @Override
<a class="jxr_linenumber" name="1569" href="#1569">1569</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitAfterChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1570" href="#1570">1570</a>         {
<a class="jxr_linenumber" name="1571" href="#1571">1571</a>             parentKeys.pop();
<a class="jxr_linenumber" name="1572" href="#1572">1572</a>         }
<a class="jxr_linenumber" name="1573" href="#1573">1573</a> 
<a class="jxr_linenumber" name="1574" href="#1574">1574</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1575" href="#1575">1575</a> <em class="jxr_javadoccomment">         * Visits the specified node. If this node has a value, its key is added</em>
<a class="jxr_linenumber" name="1576" href="#1576">1576</a> <em class="jxr_javadoccomment">         * to the internal list.</em>
<a class="jxr_linenumber" name="1577" href="#1577">1577</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1578" href="#1578">1578</a> <em class="jxr_javadoccomment">         * @param node the node to be visited</em>
<a class="jxr_linenumber" name="1579" href="#1579">1579</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1580" href="#1580">1580</a>         @Override
<a class="jxr_linenumber" name="1581" href="#1581">1581</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1582" href="#1582">1582</a>         {
<a class="jxr_linenumber" name="1583" href="#1583">1583</a>             String parentKey = parentKeys.isEmpty() ? <strong class="jxr_keyword">null</strong>
<a class="jxr_linenumber" name="1584" href="#1584">1584</a>                     : (String) parentKeys.peek();
<a class="jxr_linenumber" name="1585" href="#1585">1585</a>             String key = getExpressionEngine().nodeKey(node, parentKey);
<a class="jxr_linenumber" name="1586" href="#1586">1586</a>             parentKeys.push(key);
<a class="jxr_linenumber" name="1587" href="#1587">1587</a>             <strong class="jxr_keyword">if</strong> (node.getValue() != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1588" href="#1588">1588</a>             {
<a class="jxr_linenumber" name="1589" href="#1589">1589</a>                 keyList.add(key);
<a class="jxr_linenumber" name="1590" href="#1590">1590</a>             }
<a class="jxr_linenumber" name="1591" href="#1591">1591</a>         }
<a class="jxr_linenumber" name="1592" href="#1592">1592</a>     }
<a class="jxr_linenumber" name="1593" href="#1593">1593</a> 
<a class="jxr_linenumber" name="1594" href="#1594">1594</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1595" href="#1595">1595</a> <em class="jxr_javadoccomment">     * A specialized visitor that is able to create a deep copy of a node</em>
<a class="jxr_linenumber" name="1596" href="#1596">1596</a> <em class="jxr_javadoccomment">     * hierarchy.</em>
<a class="jxr_linenumber" name="1597" href="#1597">1597</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1598" href="#1598">1598</a>     <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNodeVisitorAdapter.html">ConfigurationNodeVisitorAdapter</a>
<a class="jxr_linenumber" name="1599" href="#1599">1599</a>     {
<a class="jxr_linenumber" name="1600" href="#1600">1600</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A stack with the actual object to be copied. */</em>
<a class="jxr_linenumber" name="1601" href="#1601">1601</a>         <strong class="jxr_keyword">private</strong> Stack&lt;ConfigurationNode&gt; copyStack;
<a class="jxr_linenumber" name="1602" href="#1602">1602</a> 
<a class="jxr_linenumber" name="1603" href="#1603">1603</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the result of the clone process. */</em>
<a class="jxr_linenumber" name="1604" href="#1604">1604</a>         <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> result;
<a class="jxr_linenumber" name="1605" href="#1605">1605</a> 
<a class="jxr_linenumber" name="1606" href="#1606">1606</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1607" href="#1607">1607</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code CloneVisitor}.</em>
<a class="jxr_linenumber" name="1608" href="#1608">1608</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1609" href="#1609">1609</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">CloneVisitor</a>()
<a class="jxr_linenumber" name="1610" href="#1610">1610</a>         {
<a class="jxr_linenumber" name="1611" href="#1611">1611</a>             copyStack = <strong class="jxr_keyword">new</strong> Stack&lt;ConfigurationNode&gt;();
<a class="jxr_linenumber" name="1612" href="#1612">1612</a>         }
<a class="jxr_linenumber" name="1613" href="#1613">1613</a> 
<a class="jxr_linenumber" name="1614" href="#1614">1614</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1615" href="#1615">1615</a> <em class="jxr_javadoccomment">         * Visits the specified node after its children have been processed.</em>
<a class="jxr_linenumber" name="1616" href="#1616">1616</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1617" href="#1617">1617</a> <em class="jxr_javadoccomment">         * @param node the node</em>
<a class="jxr_linenumber" name="1618" href="#1618">1618</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1619" href="#1619">1619</a>         @Override
<a class="jxr_linenumber" name="1620" href="#1620">1620</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitAfterChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1621" href="#1621">1621</a>         {
<a class="jxr_linenumber" name="1622" href="#1622">1622</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> copy = copyStack.pop();
<a class="jxr_linenumber" name="1623" href="#1623">1623</a>             <strong class="jxr_keyword">if</strong> (copyStack.isEmpty())
<a class="jxr_linenumber" name="1624" href="#1624">1624</a>             {
<a class="jxr_linenumber" name="1625" href="#1625">1625</a>                 result = copy;
<a class="jxr_linenumber" name="1626" href="#1626">1626</a>             }
<a class="jxr_linenumber" name="1627" href="#1627">1627</a>         }
<a class="jxr_linenumber" name="1628" href="#1628">1628</a> 
<a class="jxr_linenumber" name="1629" href="#1629">1629</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1630" href="#1630">1630</a> <em class="jxr_javadoccomment">         * Visits and copies the specified node.</em>
<a class="jxr_linenumber" name="1631" href="#1631">1631</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1632" href="#1632">1632</a> <em class="jxr_javadoccomment">         * @param node the node</em>
<a class="jxr_linenumber" name="1633" href="#1633">1633</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1634" href="#1634">1634</a>         @Override
<a class="jxr_linenumber" name="1635" href="#1635">1635</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="1636" href="#1636">1636</a>         {
<a class="jxr_linenumber" name="1637" href="#1637">1637</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> copy = (ConfigurationNode) node.clone();
<a class="jxr_linenumber" name="1638" href="#1638">1638</a>             copy.setParentNode(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="1639" href="#1639">1639</a> 
<a class="jxr_linenumber" name="1640" href="#1640">1640</a>             <strong class="jxr_keyword">if</strong> (!copyStack.isEmpty())
<a class="jxr_linenumber" name="1641" href="#1641">1641</a>             {
<a class="jxr_linenumber" name="1642" href="#1642">1642</a>                 <strong class="jxr_keyword">if</strong> (node.isAttribute())
<a class="jxr_linenumber" name="1643" href="#1643">1643</a>                 {
<a class="jxr_linenumber" name="1644" href="#1644">1644</a>                     copyStack.peek().addAttribute(copy);
<a class="jxr_linenumber" name="1645" href="#1645">1645</a>                 }
<a class="jxr_linenumber" name="1646" href="#1646">1646</a>                 <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="1647" href="#1647">1647</a>                 {
<a class="jxr_linenumber" name="1648" href="#1648">1648</a>                     copyStack.peek().addChild(copy);
<a class="jxr_linenumber" name="1649" href="#1649">1649</a>                 }
<a class="jxr_linenumber" name="1650" href="#1650">1650</a>             }
<a class="jxr_linenumber" name="1651" href="#1651">1651</a> 
<a class="jxr_linenumber" name="1652" href="#1652">1652</a>             copyStack.push(copy);
<a class="jxr_linenumber" name="1653" href="#1653">1653</a>         }
<a class="jxr_linenumber" name="1654" href="#1654">1654</a> 
<a class="jxr_linenumber" name="1655" href="#1655">1655</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1656" href="#1656">1656</a> <em class="jxr_javadoccomment">         * Returns the result of the clone process. This is the root node of the</em>
<a class="jxr_linenumber" name="1657" href="#1657">1657</a> <em class="jxr_javadoccomment">         * cloned node hierarchy.</em>
<a class="jxr_linenumber" name="1658" href="#1658">1658</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1659" href="#1659">1659</a> <em class="jxr_javadoccomment">         * @return the cloned root node</em>
<a class="jxr_linenumber" name="1660" href="#1660">1660</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1661" href="#1661">1661</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> getClone()
<a class="jxr_linenumber" name="1662" href="#1662">1662</a>         {
<a class="jxr_linenumber" name="1663" href="#1663">1663</a>             <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="1664" href="#1664">1664</a>         }
<a class="jxr_linenumber" name="1665" href="#1665">1665</a>     }
<a class="jxr_linenumber" name="1666" href="#1666">1666</a> 
<a class="jxr_linenumber" name="1667" href="#1667">1667</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1668" href="#1668">1668</a> <em class="jxr_javadoccomment">     * A specialized visitor base class that can be used for storing the tree of</em>
<a class="jxr_linenumber" name="1669" href="#1669">1669</a> <em class="jxr_javadoccomment">     * configuration nodes. The basic idea is that each node can be associated</em>
<a class="jxr_linenumber" name="1670" href="#1670">1670</a> <em class="jxr_javadoccomment">     * with a reference object. This reference object has a concrete meaning in</em>
<a class="jxr_linenumber" name="1671" href="#1671">1671</a> <em class="jxr_javadoccomment">     * a derived class, e.g. an entry in a JNDI context or an XML element. When</em>
<a class="jxr_linenumber" name="1672" href="#1672">1672</a> <em class="jxr_javadoccomment">     * the configuration tree is set up, the {@code load()} method is</em>
<a class="jxr_linenumber" name="1673" href="#1673">1673</a> <em class="jxr_javadoccomment">     * responsible for setting the reference objects. When the configuration</em>
<a class="jxr_linenumber" name="1674" href="#1674">1674</a> <em class="jxr_javadoccomment">     * tree is later modified, new nodes do not have a defined reference object.</em>
<a class="jxr_linenumber" name="1675" href="#1675">1675</a> <em class="jxr_javadoccomment">     * This visitor class processes all nodes and finds the ones without a</em>
<a class="jxr_linenumber" name="1676" href="#1676">1676</a> <em class="jxr_javadoccomment">     * defined reference object. For those nodes the {@code insert()}</em>
<a class="jxr_linenumber" name="1677" href="#1677">1677</a> <em class="jxr_javadoccomment">     * method is called, which must be defined in concrete sub classes. This</em>
<a class="jxr_linenumber" name="1678" href="#1678">1678</a> <em class="jxr_javadoccomment">     * method can perform all steps to integrate the new node into the original</em>
<a class="jxr_linenumber" name="1679" href="#1679">1679</a> <em class="jxr_javadoccomment">     * structure.</em>
<a class="jxr_linenumber" name="1680" href="#1680">1680</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="1681" href="#1681">1681</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="1682" href="#1682">1682</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">abstract</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">BuilderVisitor</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">NodeVisitor</a>
<a class="jxr_linenumber" name="1683" href="#1683">1683</a>     {
<a class="jxr_linenumber" name="1684" href="#1684">1684</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1685" href="#1685">1685</a> <em class="jxr_javadoccomment">         * Visits the specified node before its children have been traversed.</em>
<a class="jxr_linenumber" name="1686" href="#1686">1686</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1687" href="#1687">1687</a> <em class="jxr_javadoccomment">         * @param node the node to visit</em>
<a class="jxr_linenumber" name="1688" href="#1688">1688</a> <em class="jxr_javadoccomment">         * @param key the current key</em>
<a class="jxr_linenumber" name="1689" href="#1689">1689</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1690" href="#1690">1690</a>         @Override
<a class="jxr_linenumber" name="1691" href="#1691">1691</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> visitBeforeChildren(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> node, <a href="../../../../org/apache/commons/configuration/ConfigurationKey.html">ConfigurationKey</a> key)
<a class="jxr_linenumber" name="1692" href="#1692">1692</a>         {
<a class="jxr_linenumber" name="1693" href="#1693">1693</a>             Collection&lt;ConfigurationNode&gt; subNodes = <strong class="jxr_keyword">new</strong> LinkedList&lt;ConfigurationNode&gt;(node.getChildren());
<a class="jxr_linenumber" name="1694" href="#1694">1694</a>             subNodes.addAll(node.getAttributes());
<a class="jxr_linenumber" name="1695" href="#1695">1695</a>             Iterator&lt;ConfigurationNode&gt; children = subNodes.iterator();
<a class="jxr_linenumber" name="1696" href="#1696">1696</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> sibling1 = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1697" href="#1697">1697</a>             <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> nd = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="1698" href="#1698">1698</a> 
<a class="jxr_linenumber" name="1699" href="#1699">1699</a>             <strong class="jxr_keyword">while</strong> (children.hasNext())
<a class="jxr_linenumber" name="1700" href="#1700">1700</a>             {
<a class="jxr_linenumber" name="1701" href="#1701">1701</a>                 <em class="jxr_comment">// find the next new node</em>
<a class="jxr_linenumber" name="1702" href="#1702">1702</a>                 <strong class="jxr_keyword">do</strong>
<a class="jxr_linenumber" name="1703" href="#1703">1703</a>                 {
<a class="jxr_linenumber" name="1704" href="#1704">1704</a>                     sibling1 = nd;
<a class="jxr_linenumber" name="1705" href="#1705">1705</a>                     Object obj = children.next();
<a class="jxr_linenumber" name="1706" href="#1706">1706</a>                     nd = getNodeFor(obj);
<a class="jxr_linenumber" name="1707" href="#1707">1707</a>                 } <strong class="jxr_keyword">while</strong> (nd.getReference() != <strong class="jxr_keyword">null</strong> &amp;&amp; children.hasNext());
<a class="jxr_linenumber" name="1708" href="#1708">1708</a> 
<a class="jxr_linenumber" name="1709" href="#1709">1709</a>                 <strong class="jxr_keyword">if</strong> (nd.getReference() == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1710" href="#1710">1710</a>                 {
<a class="jxr_linenumber" name="1711" href="#1711">1711</a>                     <em class="jxr_comment">// find all following new nodes</em>
<a class="jxr_linenumber" name="1712" href="#1712">1712</a>                     List&lt;Node&gt; newNodes = <strong class="jxr_keyword">new</strong> LinkedList&lt;Node&gt;();
<a class="jxr_linenumber" name="1713" href="#1713">1713</a>                     newNodes.add(nd);
<a class="jxr_linenumber" name="1714" href="#1714">1714</a>                     <strong class="jxr_keyword">while</strong> (children.hasNext())
<a class="jxr_linenumber" name="1715" href="#1715">1715</a>                     {
<a class="jxr_linenumber" name="1716" href="#1716">1716</a>                         Object obj = children.next();
<a class="jxr_linenumber" name="1717" href="#1717">1717</a>                         nd = getNodeFor(obj);
<a class="jxr_linenumber" name="1718" href="#1718">1718</a>                         <strong class="jxr_keyword">if</strong> (nd.getReference() == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1719" href="#1719">1719</a>                         {
<a class="jxr_linenumber" name="1720" href="#1720">1720</a>                             newNodes.add(nd);
<a class="jxr_linenumber" name="1721" href="#1721">1721</a>                         }
<a class="jxr_linenumber" name="1722" href="#1722">1722</a>                         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="1723" href="#1723">1723</a>                         {
<a class="jxr_linenumber" name="1724" href="#1724">1724</a>                             <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="1725" href="#1725">1725</a>                         }
<a class="jxr_linenumber" name="1726" href="#1726">1726</a>                     }
<a class="jxr_linenumber" name="1727" href="#1727">1727</a> 
<a class="jxr_linenumber" name="1728" href="#1728">1728</a>                     <em class="jxr_comment">// Insert all new nodes</em>
<a class="jxr_linenumber" name="1729" href="#1729">1729</a>                     <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> sibling2 = (nd.getReference() == <strong class="jxr_keyword">null</strong>) ? <strong class="jxr_keyword">null</strong> : nd;
<a class="jxr_linenumber" name="1730" href="#1730">1730</a>                     <strong class="jxr_keyword">for</strong> (Node insertNode : newNodes)
<a class="jxr_linenumber" name="1731" href="#1731">1731</a>                     {
<a class="jxr_linenumber" name="1732" href="#1732">1732</a>                         <strong class="jxr_keyword">if</strong> (insertNode.getReference() == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1733" href="#1733">1733</a>                         {
<a class="jxr_linenumber" name="1734" href="#1734">1734</a>                             Object ref = insert(insertNode, node, sibling1, sibling2);
<a class="jxr_linenumber" name="1735" href="#1735">1735</a>                             <strong class="jxr_keyword">if</strong> (ref != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="1736" href="#1736">1736</a>                             {
<a class="jxr_linenumber" name="1737" href="#1737">1737</a>                                 insertNode.setReference(ref);
<a class="jxr_linenumber" name="1738" href="#1738">1738</a>                             }
<a class="jxr_linenumber" name="1739" href="#1739">1739</a>                             sibling1 = insertNode;
<a class="jxr_linenumber" name="1740" href="#1740">1740</a>                         }
<a class="jxr_linenumber" name="1741" href="#1741">1741</a>                     }
<a class="jxr_linenumber" name="1742" href="#1742">1742</a>                 }
<a class="jxr_linenumber" name="1743" href="#1743">1743</a>             }
<a class="jxr_linenumber" name="1744" href="#1744">1744</a>         }
<a class="jxr_linenumber" name="1745" href="#1745">1745</a> 
<a class="jxr_linenumber" name="1746" href="#1746">1746</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="1747" href="#1747">1747</a> <em class="jxr_javadoccomment">         * Inserts a new node into the structure constructed by this builder.</em>
<a class="jxr_linenumber" name="1748" href="#1748">1748</a> <em class="jxr_javadoccomment">         * This method is called for each node that has been added to the</em>
<a class="jxr_linenumber" name="1749" href="#1749">1749</a> <em class="jxr_javadoccomment">         * configuration tree after the configuration has been loaded from its</em>
<a class="jxr_linenumber" name="1750" href="#1750">1750</a> <em class="jxr_javadoccomment">         * source. These new nodes have to be inserted into the original</em>
<a class="jxr_linenumber" name="1751" href="#1751">1751</a> <em class="jxr_javadoccomment">         * structure. The passed in nodes define the position of the node to be</em>
<a class="jxr_linenumber" name="1752" href="#1752">1752</a> <em class="jxr_javadoccomment">         * inserted: its parent and the siblings between to insert. The return</em>
<a class="jxr_linenumber" name="1753" href="#1753">1753</a> <em class="jxr_javadoccomment">         * value is interpreted as the new reference of the affected</em>
<a class="jxr_linenumber" name="1754" href="#1754">1754</a> <em class="jxr_javadoccomment">         * {@code Node} object; if it is not &lt;b&gt;null &lt;/b&gt;, it is passed</em>
<a class="jxr_linenumber" name="1755" href="#1755">1755</a> <em class="jxr_javadoccomment">         * to the node's {@code setReference()} method.</em>
<a class="jxr_linenumber" name="1756" href="#1756">1756</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="1757" href="#1757">1757</a> <em class="jxr_javadoccomment">         * @param newNode the node to be inserted</em>
<a class="jxr_linenumber" name="1758" href="#1758">1758</a> <em class="jxr_javadoccomment">         * @param parent the parent node</em>
<a class="jxr_linenumber" name="1759" href="#1759">1759</a> <em class="jxr_javadoccomment">         * @param sibling1 the sibling after which the node is to be inserted;</em>
<a class="jxr_linenumber" name="1760" href="#1760">1760</a> <em class="jxr_javadoccomment">         * can be &lt;b&gt;null &lt;/b&gt; if the new node is going to be the first child</em>
<a class="jxr_linenumber" name="1761" href="#1761">1761</a> <em class="jxr_javadoccomment">         * node</em>
<a class="jxr_linenumber" name="1762" href="#1762">1762</a> <em class="jxr_javadoccomment">         * @param sibling2 the sibling before which the node is to be inserted;</em>
<a class="jxr_linenumber" name="1763" href="#1763">1763</a> <em class="jxr_javadoccomment">         * can be &lt;b&gt;null &lt;/b&gt; if the new node is going to be the last child</em>
<a class="jxr_linenumber" name="1764" href="#1764">1764</a> <em class="jxr_javadoccomment">         * node</em>
<a class="jxr_linenumber" name="1765" href="#1765">1765</a> <em class="jxr_javadoccomment">         * @return the reference object for the node to be inserted</em>
<a class="jxr_linenumber" name="1766" href="#1766">1766</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="1767" href="#1767">1767</a>         <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">abstract</strong> Object insert(<a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> newNode, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> parent, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> sibling1, <a href="../../../../org/apache/commons/configuration/HierarchicalConfiguration.html">Node</a> sibling2);
<a class="jxr_linenumber" name="1768" href="#1768">1768</a>     }
<a class="jxr_linenumber" name="1769" href="#1769">1769</a> }
</pre>
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